Added Makefile for building syborg-graphicswrapper using GCC
At present the build fails due to the following missing headers:
KhronosAPIWrapper.h
VirtualVideoInterfaceConstants.h
platformthreading.h
protocol_MGraphicsVHWCallback.h
/* Fudge unix isatty and fileno for RISCOS */
#include <stdio.h>
#include <time.h>
int fileno(FILE *f);
int isatty(int fn);
unsigned int unixtime(unsigned int ld,unsigned int ex);
int acorntime(unsigned int *ex, unsigned int *ld, time_t ut);
int isdir(char *fn);
int isfile(char *fn);
int object_exists(char *fn);