[ruby-core:115910] [Ruby master Bug#20088] Ruby 3.3.0 does not cross-complie on arm64-darwin

Issue #20088 has been reported by stanhu (Stan Hu).

----------------------------------------
Bug #20088: Ruby 3.3.0 does not cross-complie on arm64-darwin
https://bugs.ruby-lang.org/issues/20088

* Author: stanhu (Stan Hu)
* Status: Open
* Priority: Normal
* Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
To reproduce:

```shell
docker run -it ghcr.io/rake-compiler/rake-compiler-dock-image:1.4.0.rc2-mri-arm64-darwin bash
cd /tmp
export CPPFLAGS=''
export CFLAGS='-O1 -fno-omit-frame-pointer -fno-fast-math -fstack-protector-strong '
export LDFLAGS='-pipe '
export CC=aarch64-apple-darwin-clang
export MAKE='make V=1'
rake-compiler cross-ruby VERSION=3.3.0 HOST=aarch64-apple-darwin
```


This errors out with:

```shell
aarch64-apple-darwin-clang  -O1 -fno-omit-frame-pointer -fno-fast-math -fstack-protector-strong  -fdeclspec -O3 -fno-fast-math -ggdb3 -Wall -Wextra -Wextra-tokens -Wdeprecated-declarations -Wdivision-by-zero -Wdiv-by-zero -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wshorten-64-to-32 -Wwrite-strings -Wold-style-definition -Wmissing-noreturn -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter -Wno-unused-value -Wunused-variable -Wmisleading-indentation -Wundef  -pipe -march=arm64 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -fstack-protector-strong -fno-strict-overflow -fvisibility=hidden -DRUBY_EXPORT -fPIE -I. -I.ext/include/arm64-darwin -I/usr/local/rake-compiler/sources/ruby-3.3.0/include -I/usr/local/rake-compiler/sources/ruby-3.3.0 -I/usr/local/rake-compiler/sources/ruby-3.3.0/prism -I/usr/local/rake-compiler/sources/ruby-3.3.0/e
 nc/unicode/15.0.0   -D_XOPEN_SOURCE -D_DARWIN_C_SOURCE -D_DARWIN_UNLIMITED_SELECT -D_REENTRANT    -o main.o -c /usr/local/rake-compiler/sources/ruby-3.3.0/main.c
clang: error: the clang compiler does not support '-march=arm64'
make: *** [uncommon.mk:1291: main.o] Error 1
```

This appears to be a regression due to https://github.com/ruby/ruby/pull/9250. `RUBY_DEFAULT_ARCH("$target_cpu")` is called, and this `case` statement is hit:

```ac
AS_CASE([$build_os],
        [darwin*], [ARCH_FLAG="-arch "$1],
        [ARCH_FLAG=-march=$1]
```


I'm not sure this test is correct, since `$build_os` appears to be `linux-gnu`. This results in `-march=arm64` being used, which is not a valid option even in `clang` 15.0.0.

Should `$target_cpu` and `$target_os` be considered instead?

The `configure` output shows:

```
Configuration summary for ruby version 3.3.0

   * Installation prefix: /usr/local/rake-compiler/ruby/aarch64-apple-darwin/ruby-3.3.0
   * exec prefix:         ${prefix}
   * arch:                arm64-darwin
   * site arch:           ${arch}
   * RUBY_BASE_NAME:      ruby
   * enable shared:       no
   * ruby lib prefix:     ${libdir}/${RUBY_BASE_NAME}
   * site libraries path: ${rubylibprefix}/${sitearch}
   * vendor path:         ${rubylibprefix}/vendor_ruby
   * target OS:           darwin
   * compiler:            aarch64-apple-darwin-clang
   * with thread:         pthread
   * with coroutine:      arm64
   * enable shared libs:  no
   * dynamic library ext: bundle
   * CFLAGS:              -fdeclspec ${optflags} ${debugflags} ${warnflags}
   * LDFLAGS:             -L. -pipe  -fstack-protector-strong
   * DLDFLAGS:            -pipe  -Wl,-multiply_defined,suppress -Wl,-undefined,dynamic_lookup
   * optflags:            -O3 -fno-fast-math
   * debugflags:          -ggdb3
   * warnflags:           -Wall -Wextra -Wextra-tokens -Wdeprecated-declarations -Wdivision-by-zero -Wdiv-by-zero -Wimplicit-function-declaration -Wimplicit-int -Wpointer-arith -Wshorten-64-to-32 -Wwrite-strings -Wold-style-definition \
                          -Wmissing-noreturn -Wno-constant-logical-operand -Wno-long-long -Wno-missing-field-initializers -Wno-overlength-strings -Wno-parentheses-equality -Wno-self-assign -Wno-tautological-compare -Wno-unused-parameter \
                          -Wno-unused-value -Wunused-variable -Wmisleading-indentation -Wundef
   * strip command:       aarch64-apple-darwin-strip -A -n
   * install doc:         no
   * YJIT support:        no
   * RJIT support:        no
   * man page type:       man
   * BASERUBY -v:         ruby 3.1.3p185 (2022-11-24 revision 1a6b16756e) [x86_64-linux]
```

The `configure` statement for reference:

```
./configure --host=aarch64-apple-darwin --target=aarch64-apple-darwin --build=x86_64-pc-linux-gnu --enable-install-static-library --disable-jit-support --disable-install-doc --with-ext= --enable-static --disable-shared --prefix=/usr/local/rake-compiler/ruby/aarch64-apple-darwin/ruby-3.3.0
```


This was first reported in a CI failure in https://github.com/rake-compiler/rake-compiler-dock/pull/112#issuecomment-1869367367.



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