load glCompressedTexImage2D on Windows, fix #48

src/atto

@@ -1 +1 @@
-Subproject commit 0cbd611c23d0fa8b8283c53402b97528f89d3bc8
+Subproject commit 5c28909c5881e5c5908a5a6bf92a9cab8fd2005b

src/render.c

@@ -134,6 +134,7 @@ static void a__GlPrintError(const char *message, int error) {
 	WGL__FUNCLIST_DO(PFNGLDISABLEVERTEXATTRIBARRAYPROC, DisableVertexAttribArray) \
 	WGL__FUNCLIST_DO(PFNGLVERTEXATTRIBPOINTERPROC, VertexAttribPointer) \
 	WGL__FUNCLIST_DO(PFNGLGENERATEMIPMAPPROC, GenerateMipmap) \
+	WGL__FUNCLIST_DO(PFNGLCOMPRESSEDTEXIMAGE2DPROC, CompressedTexImage2D) \
 
 #define WGL__FUNCLIST_DO(T,N) T gl##N = 0;
 WGL__FUNCLIST