patch 8.2.0658: HP-UX build fails when setenv() is not defined

Problem:    HP-UX build fails when setenv() is not defined.
Solution:   Change "colors" to "t_colors". (John Marriott)
diff --git a/src/version.c b/src/version.c
index eac5c9a..127f906 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    658,
+/**/
     657,
 /**/
     656,