patch 8.0.1532: compiler warnings without termguicolors feature

Problem:    Compiler warnings without termguicolors feature.
Solution:   Add #ifdef. (John Marriott)  Cleanup the code a bit.
diff --git a/src/version.c b/src/version.c
index 2fb2c59..c2096c7 100644
--- a/src/version.c
+++ b/src/version.c
@@ -779,6 +779,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1532,
+/**/
     1531,
 /**/
     1530,