configure.ac: remove an extraneous semicolon (Clang)

[Austin English]

-- 
-Austin
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diff --git a/configure.ac b/configure.ac
index 0b68774..1e7fcca 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1723,7 +1723,7 @@ then
   saved_CFLAGS="$CFLAGS"
   CFLAGS="$CFLAGS -Wlogical-op -Werror"
   AC_CACHE_CHECK([for broken string.h that generates warnings with -Wlogical-op], ac_cv_c_logicalop_noisy,
-      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <string.h>]], [[char*f(const char *h,char n) {return strchr(h,n);}]])],[ac_cv_c_logicalop_noisy=no],[ac_cv_c_logicalop_noisy=yes]))
+      AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <string.h>]], [[char*f(const char *h,char n) {return strchr(h,n)}]])],[ac_cv_c_logicalop_noisy=no],[ac_cv_c_logicalop_noisy=yes]))
   CFLAGS="$saved_CFLAGS"
   if test "$ac_cv_c_logicalop_noisy" = "no"
   then