patch 9.0.0494: small build misses float function declaraitons

Problem:    Small build misses float function declaraitons.
Solution:   Adjust #ifdefs.
diff --git a/src/version.c b/src/version.c
index 8493c73..88888d4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    494,
+/**/
     493,
 /**/
     492,