g.version: Fix February number (#367)

This fix is straightforward. I'm taking the liberty to merge it into 7.8.

general/g.version/local_proto.h

@@ -5,9 +5,9 @@
 #define YEAR ((((__DATE__ [7]-'0')*10+(__DATE__[8]-'0'))*10+\
 	       (__DATE__ [9]-'0'))*10+(__DATE__ [10]-'0'))
 
-/* month: 0 - 11 */
+/* month: 1 - 12 */
 #define MONTH (__DATE__ [2] == 'n' ? (__DATE__ [1] == 'a' ? 1 : 6) \
-              : __DATE__ [2] == 'b' ? 1 \
+              : __DATE__ [2] == 'b' ? 2 \
               : __DATE__ [2] == 'r' ? (__DATE__ [0] == 'M' ? 3 : 4) \
               : __DATE__ [2] == 'y' ? 5 \
               : __DATE__ [2] == 'l' ? 7 \