libgbm: Remove remaining parts of this project

After libgbm was moved into the ti-sgx-ddk-um project the recipe for
libgbm was deleted, this patch was left over, remove it here.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Denys Dmytriyenko <denys@ti.com>

recipes-graphics/gbm/libgbm/0001-gbm.c-include-sys-sysmacros.h-for-minor-major-in-new.patch

@@ -1,28 +0,0 @@
-From ea5fc8da36886490d0ee40d475733cd98e38c2ec Mon Sep 17 00:00:00 2001
-From: Denys Dmytriyenko <denys@ti.com>
-Date: Tue, 28 Aug 2018 18:35:55 -0400
-Subject: [PATCH] gbm.c: include <sys/sysmacros.h> for minor/major in new glibc
-
-glibc 2.28+ now requires this.
-https://sourceware.org/bugzilla/show_bug.cgi?id=19239
-
-Signed-off-by: Denys Dmytriyenko <denys@ti.com>
----
- gbm.c | 1 +
- 1 file changed, 1 insertion(+)
-
-diff --git a/gbm.c b/gbm.c
-index c046b1a..9356d7b 100644
---- a/gbm.c
-+++ b/gbm.c
-@@ -35,6 +35,7 @@
- #include <stdint.h>
- 
- #include <sys/types.h>
-+#include <sys/sysmacros.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include <errno.h>
--- 
-2.7.4
-