Check for std::(tr1::)function support

CMakeModules/CheckStdFunctional.cmake

@@ -0,0 +1,13 @@
+# taglib changed filenames to be a char/wchar struct on some platforms, need to check for it
+macro (CHECK_STD_FUNCTIONAL CXX_STD_FUNCTIONAL)
+	include (CheckCXXSourceCompiles)
+	check_cxx_source_compiles(
+	"
+    #include <functional>
+    using std::function;
+    int main()
+    {
+    return 0;
+    }" ${CXX_STD_FUNCTIONAL})
+endmacro()
+

CMakeModules/CheckStdTr1Functional.cmake

@@ -0,0 +1,13 @@
+# taglib changed filenames to be a char/wchar struct on some platforms, need to check for it
+macro (CHECK_STD_TR1_FUNCTIONAL CXX_STD_TR1_FUNCTIONAL)
+	include (CheckCXXSourceCompiles)
+	check_cxx_source_compiles(
+	"
+    #include <tr1/functional>
+    using std::tr1::function;
+    int main()
+    {
+    return 0;
+    }" ${CXX_STD_TR1_FUNCTIONAL})
+endmacro()
+