Utilities/Release: Compile OS X binary as C++11

We already compile with `-stdlib=libc++` as required for Qt 5.6.
We can compile as C++11 and still deploy to OS X 10.7.

Utilities/Release/osx_release.cmake

@@ -13,6 +13,8 @@ set(CFLAGS   "")
 set(CXXFLAGS "-stdlib=libc++")
 set(INITIAL_CACHE "
 CMAKE_BUILD_TYPE:STRING=Release
+CMAKE_C_STANDARD:STRING=11
+CMAKE_CXX_STANDARD:STRING=11
 CMAKE_OSX_ARCHITECTURES:STRING=x86_64
 CMAKE_OSX_DEPLOYMENT_TARGET:STRING=10.7
 CMAKE_SKIP_BOOTSTRAP_TEST:STRING=TRUE
@@ -21,8 +23,6 @@ BUILD_QtDialog:BOOL=TRUE
 CMake_GUI_DISTRIBUTE_WITH_Qt_LGPL:STRING=3
 CMake_INSTALL_DEPENDENCIES:BOOL=ON
 CMAKE_SKIP_RPATH:BOOL=TRUE
-CMake_NO_C_STANDARD:BOOL=TRUE
-CMake_NO_CXX_STANDARD:BOOL=TRUE
 CMake_TEST_NO_FindPackageModeMakefileTest:BOOL=TRUE
 ")
 set(ENV [[