[ruby-dev:49692] [Ruby trunk Bug#12524] Excess semicolons in ext/digest and ext/openssl

Issue #12524 has been reported by Naohisa Goto.

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Bug #12524: Excess semicolons in ext/digest and ext/openssl
https://bugs.ruby-lang.org/issues/12524

* Author: Naohisa Goto
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: 
* Backport: 2.1: UNKNOWN, 2.2: UNKNOWN, 2.3: UNKNOWN
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ext/digest については r49564 以降、 ext/openssl については r55285 以降、
Solaris 10 上の Oracle Solaris Studio 12.x によるコンパイル時に以下のwarningが出ます。

```
compiling md5init.c
"md5ossl.h", line 11: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
（略）
compiling sha1init.c
"sha1ossl.h", line 18: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
（略）
compiling sha2init.c
"sha2ossl.h", line 23: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
"sha2ossl.h", line 24: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
"sha2ossl.h", line 25: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
（略）
compiling ossl_pkey_rsa.c
"ossl_pkey_rsa.c", line 659: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
"ossl_pkey_rsa.c", line 660: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
"ossl_pkey_rsa.c", line 661: warning: syntax error:  empty declaration (E_EMPTY_DECLARATION)
```

原因は [Bug #12470] とほぼ同様です。つまり、マクロ使用時の最後のセミコロンが余計で、何も内容の無い行が発生して、empty declaration の警告が出ています。




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