Issue #17615: Comparing two Unicode strings now uses wmemcmp() when possible
wmemcmp() is twice faster than a dummy loop (342 usec vs 744 usec) on Fedora
18/x86_64, GCC 4.7.2.
diff --git a/configure.ac b/configure.ac
index caef808..053e4a4 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2816,7 +2816,7 @@
sigtimedwait sigwait sigwaitinfo snprintf strftime strlcpy symlinkat sync \
sysconf tcgetpgrp tcsetpgrp tempnam timegm times tmpfile tmpnam tmpnam_r \
truncate uname unlinkat unsetenv utimensat utimes waitid waitpid wait3 wait4 \
- wcscoll wcsftime wcsxfrm writev _getpty)
+ wcscoll wcsftime wcsxfrm wmemcmp writev _getpty)
AC_CHECK_DECL(dirfd,
AC_DEFINE(HAVE_DIRFD, 1,