[ruby-core:65039] [ruby-trunk - Bug #8315] mkmf does not include include paths from pkg_config anymore

Issue #8315 has been updated by Tomoyuki Chikanaga.

Backport changed from 2.0.0: REQUIRED, 2.1: REQUIRED to 2.0.0: REQUIRED, 2.1: DONE

Backported into `ruby_2_1` branch at r47587.

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Bug #8315: mkmf does not include include paths from pkg_config anymore
https://bugs.ruby-lang.org/issues/8315#change-48908

* Author: Hans Mackowiak
* Status: Closed
* Priority: Normal
* Assignee: Nobuyoshi Nakada
* Category: ext
* Target version: 
* ruby -v: trunk
* Backport: 2.0.0: REQUIRED, 2.1: DONE
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#6504 does that, for cpp files `$CFLAGS` is not used anymore, so the problems are the include paths:

* there is no `$CXXFLAGS` global variable defined
* pkg_config does not add the includes paths to the correct `*FLAGS`


so my gems are currently broken for ruby trunk and if i fix that it may be broken for the older ruby 




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