libroot: Synchronize glibc regex with upstream 2.28.

libroot: Synchronize glibc regex with upstream 2.20.

More recent versions require more changes to adapt.

To be validated as part of bug #6386. Update glibc regex to 2.11, headers/posix/regex.h included. This imposes some changes in some of our sources using the regex.h,
mostly bin tools and mail kit. T

To be validated as part of bug #6386. Update glibc regex to 2.11, headers/posix/regex.h included. This imposes some changes in some of our sources using the regex.h,
mostly bin tools and mail kit. The use of __USE_GNU macro is needed for instance when the expected regex implementation is the GNU one.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@38031 a95241bf-73f2-0310-859d-f6bbb57e9c96

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