Added EGL interface for backends.

include/backend/egl.h

@@ -0,0 +1,17 @@
+#ifndef WLR_BACKEND_EGL_H
+#define WLR_BACKEND_EGL_H
+
+#include <EGL/egl.h>
+#include <stdbool.h>
+
+struct wlr_egl {
+	EGLDisplay display;
+	EGLConfig config;
+	EGLContext context;
+};
+
+bool wlr_egl_init(struct wlr_egl *egl, EGLenum platform, void *display);
+void wlr_egl_free(struct wlr_egl *egl);
+EGLSurface wlr_egl_create_surface(struct wlr_egl *egl, void *window);
+
+#endif

include/wlr/common/log.h

@@ -1,6 +1,7 @@
 #ifndef _WLR_COMMON_LOG_H
 #define _WLR_COMMON_LOG_H
 #include <stdbool.h>
+#include <stdarg.h>
 
 typedef enum {
 	L_SILENT = 0,