Update to the latest version of ACX_PTHEAD.
Fixes an issue with the macro expecting pthread_t to be convertable from an int, which isn't true on mingw where pthread_t is a struct. Also move the macro out of acinclude.m4 and into its own file in the m4 subdirectory. Thanks to Laura Michaels for reporting the issue. svn path=/trunk/vorbis-tools/; revision=18791
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