patch 8.1.2417: MinGW/Cygwin build does not clean up all files

Problem:    MinGW/Cygwin build does not clean up all files.
Solution:   Delete *.map files. (Michael Soyka)
diff --git a/src/version.c b/src/version.c
index 1831286..0956f87 100644
--- a/src/version.c
+++ b/src/version.c
@@ -743,6 +743,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    2417,
+/**/
     2416,
 /**/
     2415,