collada2gltf: drop tr1 support

The detection code is wrong for gcc 4.6 and the tr1 code actually
conflicts with the OpenCOLLADA code, because it creates an ambiguity
of shared_ptr in the cpp files.

Additionally most of the headers already use std::shared_ptr or
std::unordered_map.

Change-Id: Ibfe80e45687d34ec6fcd23339fd3f968fae402ba
Reviewed-on: https://gerrit.libreoffice.org/11695Reviewed-by: Zolnai Tamás <tamas.zolnai@collabora.com>
Tested-by: Zolnai Tamás <tamas.zolnai@collabora.com>

external/collada2gltf/UnpackedTarball_collada2gltf.mk

@@ -19,6 +19,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,collada2gltf,\
 	external/collada2gltf/patches/collada2gltf.fix-memory-leak.patch.1 \
 	external/collada2gltf/patches/collada2gltf.fix-memory-leak2.patch.1 \
 	external/collada2gltf/patches/shader_compatibility.patch.1 \
+	external/collada2gltf/patches/drop_tr1_support.patch.1 \
 ))
 
 # vim: set noet sw=4 ts=4: