Include r600_emit.h for r600EmitShader and r600EmitShaderConsts symbols.
Fixes the following GCC warnings.
evergreen_fragprog.c: In function 'evergreenSetupFragmentProgram':
evergreen_fragprog.c:521: warning: implicit declaration of function 'r600EmitShader'
evergreen_fragprog.c:778: warning: implicit declaration of function 'r600EmitShaderConsts'
#include "r600_context.h"
#include "r600_cmdbuf.h"
+#include "r600_emit.h"
#include "evergreen_vertprog.h"
#include "evergreen_fragprog.h"