fix placement of CHECK_LIBS test for kevent64

Need to run this check independent of the check for sys/event64
so that HAVE_KEVENT64 will be checked and defined on all platforms.

Signed-off-by: Daniel A. Steffen <dsteffen@apple.com>

Author: dgrove-oss

configure.ac

@@ -137,13 +137,12 @@ AC_SEARCH_LIBS(pthread_create, pthread)
 # Prefer native kqueue(2); otherwise use libkqueue if present.
 #
 AC_CHECK_HEADER(sys/event.h, [],
-  [PKG_CHECK_MODULES(KQUEUE, libkqueue)
-   AC_SEARCH_LIBS(kevent, kqueue)
-   AC_SEARCH_LIBS(kevent64, kqueue,
-                 [AC_DEFINE(HAVE_KEVENT64, 1, [Define if kevent64 is present])],
-                 [AC_DEFINE(HAVE_KEVENT64, 0, [Define if kevent64 is present])])]
+  [PKG_CHECK_MODULES(KQUEUE, libkqueue)]
 )
-
+AC_SEARCH_LIBS(kevent, kqueue)
+AC_SEARCH_LIBS(kevent64, kqueue,
+               [AC_DEFINE(HAVE_KEVENT64, 1, [Define if kevent64 is present])],
+               [AC_DEFINE(HAVE_KEVENT64, 0, [Define if kevent64 is present])])
 
 #
 # Checks for header files.