plugin core: swap duplicated prototypes for missing includes

This file is calling functions `xml_string` `xml_url_string` without including
the header that prototypes them, utils.h. There seems to be no reason to avoid
this and locally re-prototype these functions.

Related to #1868.

diff --git a/plugin/core/gvrender_core_map.c b/plugin/core/gvrender_core_map.c
index ba9079e1d17447dff51106b06b873e60c36bda53..8d9fe61011fc3e926bfd037002544d1801a3b041 100644 (file)
--- a/plugin/core/gvrender_core_map.c
+++ b/plugin/core/gvrender_core_map.c
@@ -12,13 +12,12 @@
 
 #include <stdlib.h>
 
+#include <common/types.h>
+#include <common/utils.h>
 #include <gvc/gvplugin_render.h>
 #include <gvc/gvplugin_device.h>
 #include <gvc/gvio.h>
 
-extern char *xml_string(char *str);
-extern char *xml_url_string(char *str);
-
 typedef enum { FORMAT_IMAP, FORMAT_ISMAP, FORMAT_CMAP, FORMAT_CMAPX, } format_type;
 
 static void map_output_shape (GVJ_t *job, map_shape_t map_shape, pointf * AF, int nump,