Change version information for the 2.1 release

Signed-hostap: Jouni Malinen <j@w1.fi>

src/common/version.h

@@ -5,6 +5,6 @@
 #define VERSION_STR_POSTFIX ""
 #endif /* VERSION_STR_POSTFIX */
 
-#define VERSION_STR "2.1-devel" VERSION_STR_POSTFIX
+#define VERSION_STR "2.1" VERSION_STR_POSTFIX
 
 #endif /* VERSION_H */