From: Michael R. Crusoe <crusoe@debian.org>
Subject: Add missing include and function definition
Bug: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1066345

Debian now builds with "-Werror=implicit-function-declaration", which caught
these bugs.

--- libgdchart-gd2.orig/gdc.c
+++ libgdchart-gd2/gdc.c
@@ -4,6 +4,7 @@
 #define GDC_INCL
 #define GDC_LIB
 #include <math.h>
+#include <string.h>
 #include "gdc.h"
 
 struct	GDC_FONT_T	GDC_fontc[GDC_numfonts] = { (gdFontPtr)NULL, 8,  5,
--- libgdchart-gd2.orig/gdc.h
+++ libgdchart-gd2/gdc.h
@@ -121,6 +121,7 @@
 				}	GDCfnt_sz( char* str, enum GDC_font_size gdfontsz, char* ttfont, double ttfptsz, double angle, char **status );
 
 int		GDCImageStringNL( gdImagePtr, struct GDC_FONT_T*, char*, double, double, int, int, char*, int, GDC_justify_t, char** );
+long get_uniq_color( gdImagePtr	im );
 void	load_font_conversions();
 short	cnt_nl( char*, int* );
 #endif