external/opencollada: Adapt to clang -stdlib=libc++

For one, libc++ has no <tr1/unordered_*> headers, and for another, std::isnan
needs <cmath>.

Change-Id: I39179a9069826cb08bac19c0f6e56acdc1ab6b9d

external/opencollada/UnpackedTarball_opencollada.mk

@@ -16,6 +16,7 @@ $(eval $(call gb_UnpackedTarball_add_patches,opencollada,\
 	external/opencollada/patches/0002-Expose-sid-for-textures-in-extras.patch.1 \
 	external/opencollada/patches/opencollada.clang.patch.0 \
 	external/opencollada/patches/opencollada.libxml.patch.0 \
+	external/opencollada/patches/libc++.patch.0 \
 ))
 
 # vim: set noet sw=4 ts=4:

external/opencollada/patches/libc++.patch.0

+--- COLLADABaseUtils/include/COLLADABUhash_map.h
++++ COLLADABaseUtils/include/COLLADABUhash_map.h
+@@ -60,7 +60,7 @@
+         #define COLLADABU_HASH_NAMESPACE_CLOSE }
+         #define COLLADABU_HASH_FUN hash
+     #endif
+-#elif (defined(__APPLE__) || defined(__FreeBSD__)) && defined(_LIBCPP_VERSION)
++#elif defined(_LIBCPP_VERSION)
+     #include <unordered_map>
+     #include <unordered_set>
+     #define COLLADABU_HASH_MAP std::unordered_map
+--- GeneratedSaxParser/src/GeneratedSaxParserUtils.cpp
++++ GeneratedSaxParser/src/GeneratedSaxParserUtils.cpp
+@@ -10,6 +10,7 @@
+ 
+ #include "GeneratedSaxParserUtils.h"
+ #include <math.h>
++#include <cmath>
+ #include <memory>
+ #include <string.h>
+ #include <limits>