Revert "fix OpenGL error in libgltf"

New tarball already contains the fix for it.

This reverts commit 6f855fed.

external/libgltf/UnpackedTarball_libgltf.mk

@@ -33,7 +33,6 @@ $(eval $(call gb_UnpackedTarball_add_patches,libgltf,\
 	external/libgltf/patches/comma_at_end_of_enumerator_list.patch \
 	external/libgltf/patches/extra_semicolon.patch \
 	external/libgltf/patches/stop_a_potential_memory_leak.patch \
-	external/libgltf/patches/wrong_shader_program_delete.patch.1 \
 ))
 
 # vim: set noet sw=4 ts=4:

external/libgltf/patches/wrong_shader_program_delete.patch.1

-diff -ur libgltf.org/src/Shaders.cpp libgltf/src/Shaders.cpp
---- libgltf.org/src/Shaders.cpp	2014-07-06 03:33:15.205313955 +0200
-+++ libgltf/src/Shaders.cpp	2014-07-06 03:34:33.079310767 +0200
-@@ -144,7 +144,7 @@
- 
- void ShaderProgram::deleteProgram(unsigned int programId)
- {
--    glDeleteShader(programId);
-+    glDeleteProgram(programId);
- }
- 
- void ShaderProgram::useProgram(unsigned int programId)