patch 7.4.1463

Problem:    Configure doesn't find isinf() and isnan() on some systems.
Solution:   Use a configure check that includes math.h.

src/version.c

@@ -743,6 +743,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1463,
 /**/
     1462,
 /**/