Stop checking for nullptr

We're already requiring the compiler to implement C++11, so checking for
nullptr support again is useless.

CMakeLists.txt

@@ -71,7 +71,6 @@ if(USE_GCC_STD_0X)
 endif()
 
 REQUIRE_CXX_SOURCE_COMPILES("#include <memory>\nint main() { std::unique_ptr<int> a; std::shared_ptr<int> b; }" HAVE_C11_SMART_PTRS)
-CHECK_CXX_SOURCE_COMPILES("int main() { void *d = nullptr; }" HAVE_NULLPTR)
 REQUIRE_CXX_SOURCE_COMPILES("int main() { static_assert(true, \"\"); }" HAVE_STATIC_ASSERT)
 CHECK_CXX_SOURCE_COMPILES("#include <memory>\nint main() { auto a = std::make_unique<int>(0); }" HAVE_MAKE_UNIQUE)
 REQUIRE_CXX_SOURCE_COMPILES("template<class... T> class C; int main() { return 0; }" HAVE_VARIADIC_TEMPLATES)

config.h.cmake

@@ -25,9 +25,6 @@
 /* Define to 1 if your stdlib has std::make_unique */
 #cmakedefine HAVE_MAKE_UNIQUE 1
 
-/* Define to 1 if you have support for nullptr. */
-#cmakedefine HAVE_NULLPTR 1
-
 /* Define to 1 if you have the <poll.h> header file. */
 #cmakedefine HAVE_POLL_H 1
 

src/platform/PlatformAbstraction.h

@@ -74,10 +74,8 @@
 
 
 // C++0x nullptr
-#ifdef HAVE_NULLPTR
 #undef NULL
 #define NULL nullptr
-#endif