patch 8.1.0962: building with MinGW and static libs doesn't work

Problem:    Building with MinGW and static libs doesn't work. (Salman Halim)
Solution:   Add -lgcc. (Ken Takata)
diff --git a/src/version.c b/src/version.c
index db9ab91..59a4e02 100644
--- a/src/version.c
+++ b/src/version.c
@@ -780,6 +780,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    962,
+/**/
     961,
 /**/
     960,