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)

src/version.c

@@ -734,6 +734,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    5101,
 /**/
     5100,
 /**/