1. moved the test for glibc >= 2.1 after AC_PROG_CC
2. fixed this test so the result is realyl cached 3. added test for fnmatch() because when cross-compiling we can find fnmatch.h but fnmatch() could still be unaccessible git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@15480 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
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