patch 8.2.5101: MS-Windows with MinGW: $CC may be "cc" instead of "gcc"

Problem:    MS-Windows with MinGW: $CC may be "cc" instead of "gcc".
Solution:   Set $CC if it is not matching "clang". (Yegappan Lakshmanan,
            closes #10578)
diff --git a/src/version.c b/src/version.c
index 74e8595..3e64ae4 100644
--- a/src/version.c
+++ b/src/version.c
@@ -735,6 +735,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    5101,
+/**/
     5100,
 /**/
     5099,