Check for xf86CursorResetCursor

If it's available, Xorg calls it on each mode configuration change. It
does what xf86_reload_cursors does (and more), so we don't need to call
the latter anymore.

(Ported from radeon commit d670c5c9851b4eff21c845d26c7d7e4eb5ee0fa9)

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

configure.ac

@@ -163,6 +163,12 @@ AC_CHECK_DECL(fbGlyphs,
 	       #include <glyphstr.h>
 	       #include <fbpict.h>])
 
+AC_CHECK_DECL(xf86CursorResetCursor,
+	      [AC_DEFINE(HAVE_XF86_CURSOR_RESET_CURSOR, 1,
+	      [Have xf86CursorResetCursor API])], [],
+	      [#include <xorg-server.h>
+	       #include <xf86Cursor.h>])
+
 AC_CHECK_DECL(xorg_list_init,
 	      [AC_DEFINE(HAVE_XORG_LIST, 1, [Have xorg_list API])], [],
 	      [#include <X11/Xdefs.h>

src/drmmode_display.c

@@ -812,8 +812,10 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		break;
 	}
 
+#ifndef HAVE_XF86_CURSOR_RESET_CURSOR
 	if (!info->hwcursor_disabled)
 		xf86_reload_cursors(pScreen);
+#endif
 
 done:
 	free(output_ids);