patch 9.0.1450: MacOS: building fails if clock_gettime() is not available

Problem:    MacOS: building fails if clock_gettime() is not available.
Solution:   Add a configure check for clock_gettime(). (closes #12242)
diff --git a/src/version.c b/src/version.c
index 23b39e7..ae81daa 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1450,
+/**/
     1449,
 /**/
     1448,