Add a dummy define to make fix the autotools build for now. To
actually build WinRT support, use the meson build.
GST_GL_HAVE_WINDOW_EAGL=0
GST_GL_HAVE_WINDOW_VIV_FB=0
GST_GL_HAVE_WINDOW_GBM=0
+GST_GL_HAVE_WINDOW_WINRT=0
if test "x$HAVE_WINDOW_X11" = "xyes"; then
GL_WINDOWS="x11 $GL_WINDOWS"
#define GST_GL_HAVE_WINDOW_EAGL $GST_GL_HAVE_WINDOW_EAGL
#define GST_GL_HAVE_WINDOW_VIV_FB $GST_GL_HAVE_WINDOW_VIV_FB
#define GST_GL_HAVE_WINDOW_GBM $GST_GL_HAVE_WINDOW_GBM
+#define GST_GL_HAVE_WINDOW_WINRT $GST_GL_HAVE_WINDOW_WINRT
"
dnl PLATFORM's