fix OpenGL error in libgltf

The code tried to free a program as a shader

Change-Id: I47de706044a5756cf972d9fdb38cac2ca1355414

external/libgltf/UnpackedTarball_libgltf.mk

@@ -33,6 +33,7 @@ $(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)