Allow DGL_USE_RGBA macro, will setup 24 depth bits and glx RGBA

Signed-off-by: falkTX <falktx@falktx.com>

dgl/src/WindowPrivateData.cpp

@@ -249,7 +249,11 @@ void Window::PrivateData::initPre(const uint width, const uint height, const boo
     puglSetHandle(view, this);
     puglSetViewHint(view, PUGL_RESIZABLE, resizable ? PUGL_TRUE : PUGL_FALSE);
     puglSetViewHint(view, PUGL_IGNORE_KEY_REPEAT, PUGL_FALSE);
+#if DGL_USE_RGBA
+    puglSetViewHint(view, PUGL_DEPTH_BITS, 24);
+#else
     puglSetViewHint(view, PUGL_DEPTH_BITS, 16);
+#endif
     puglSetViewHint(view, PUGL_STENCIL_BITS, 8);
 #ifdef DGL_USE_OPENGL3
     puglSetViewHint(view, PUGL_USE_COMPAT_PROFILE, PUGL_FALSE);

dgl/src/pugl-upstream

@@ -1 +1 @@
-Subproject commit 0fdc19059de5214973ae6ec0d775470f94ceb1c9
+Subproject commit b63bafa9cb5813729a928a6f364c997ff4e3bd6a