Solaris does not support C99 format strings before version 10

Signed-off-by: Dennis Stosberg <dennis@stosberg.net>
Signed-off-by: Junio C Hamano <junkio@cox.net>

Makefile

@@ -301,10 +301,12 @@ ifeq ($(uname_S),SunOS)
 		NEEDS_LIBICONV = YesPlease
 		NO_UNSETENV = YesPlease
 		NO_SETENV = YesPlease
+		NO_C99_FORMAT = YesPlease
 	endif
 	ifeq ($(uname_R),5.9)
 		NO_UNSETENV = YesPlease
 		NO_SETENV = YesPlease
+		NO_C99_FORMAT = YesPlease
 	endif
 	INSTALL = ginstall
 	TAR = gtar