remove 'extern' from include/colors.h

git-svn-id: https://svn.osgeo.org/grass/grass/trunk@38149 15284696-431f-4ddb-bdfa-cd5b030d7da7

include/colors.h

@@ -41,10 +41,10 @@ struct color_name
     int number;
 };
 
-extern int G_num_standard_colors(void);
-extern struct color_rgb G_standard_color_rgb(int);
-extern int G_num_standard_color_names(void);
-extern const struct color_name *G_standard_color_name(int);
-extern int G_str_to_color(const char *, int *, int *, int *);
+int G_num_standard_colors(void);
+struct color_rgb G_standard_color_rgb(int);
+int G_num_standard_color_names(void);
+const struct color_name *G_standard_color_name(int);
+int G_str_to_color(const char *, int *, int *, int *);
 
 #endif