gl-renderer: Rename gl_renderer::output_create to output_window_create

No functional change. This patch renames gl_renderer_output_create() to
gl_renderer_output_window_create(), which is something more descriptive
of what the function does.

Signed-off-by: Miguel A Vico Moya <mvicomoya@nvidia.com>
Reviewed-by: Andy Ritger <aritger@nvidia.com>
Reviewed-by: James Jones <jajones@nvidia.com>
Reviewed-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
diff --git a/libweston/compositor-x11.c b/libweston/compositor-x11.c
index ccee8db..0804591 100644
--- a/libweston/compositor-x11.c
+++ b/libweston/compositor-x11.c
@@ -923,12 +923,13 @@
 		 * but eglCreateWindowSurface takes a Window. */
 		Window xid = (Window) output->window;
 
-		ret = gl_renderer->output_create(&output->base,
-						 (EGLNativeWindowType) output->window,
-						 &xid,
-						 gl_renderer->opaque_attribs,
-						 NULL,
-						 0);
+		ret = gl_renderer->output_window_create(
+					&output->base,
+					(EGLNativeWindowType) output->window,
+					&xid,
+					gl_renderer->opaque_attribs,
+					NULL,
+					0);
 		if (ret < 0)
 			goto err;
 	}