bpo-11063: Use more reliable way to check if uuid function exists (GH-4343)

diff --git a/configure b/configure
index 7944f8f..0e74828 100755
--- a/configure
+++ b/configure
@@ -9522,8 +9522,7 @@
 {
 
 #ifndef uuid_generate_time_safe
-uuid_t out;
-uuid_generate_time_safe(out);
+void *x = uuid_generate_time_safe
 #endif
 
   ;
diff --git a/configure.ac b/configure.ac
index 743e062..1a309c8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2680,8 +2680,7 @@
 AC_MSG_CHECKING(for uuid_generate_time_safe)
 AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[#include <uuid/uuid.h>]], [[
 #ifndef uuid_generate_time_safe
-uuid_t out;
-uuid_generate_time_safe(out);
+void *x = uuid_generate_time_safe
 #endif
 ]])],
   [AC_DEFINE(HAVE_UUID_GENERATE_TIME_SAFE, 1, Define if uuid_generate_time_safe() exists.)