patch 8.1.0482: MinGW "make clean" deletes all .exe files

Problem:    MinGW "make clean" deletes all .exe files.
Solution:   Only delete .exe files that it builds. (Ken takata)
diff --git a/src/version.c b/src/version.c
index dada7a7..09334c4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -793,6 +793,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    482,
+/**/
     481,
 /**/
     480,