Build: require C11/C++11 for all operating systems in master.

This is in preparation of upgrading our library dependencies, some of which
need C++11. We already use C++11 in blender2.8 and for Windows and macOS, so
this just affects Linux.

On many distributions this will not require any changes, on some
install_deps.sh will need to be run again to rebuild libraries.

Differential Revision: https://developer.blender.org/D3568

source/blender/depsgraph/util/deg_util_function.h

@@ -30,81 +30,8 @@
 
 #pragma once
 
-#if (__cplusplus > 199711L) || (defined(_MSC_VER) && _MSC_VER >= 1900)
-
 #include <functional>
 
 using std::function;
 using namespace std::placeholders;
 #define function_bind std::bind
-
-#elif defined(HAVE_BOOST_FUNCTION_BINDINGS)
-
-#include <boost/bind.hpp>
-#include <boost/function.hpp>
-
-using boost::function;
-#define function_bind boost::bind
-
-#else
-
-#pragma message("No available function binding implementation. Using stub instead, disabling new depsgraph")
-
-#ifndef WITH_LEGACY_DEPSGRAPH
-#  error "Unable to build new depsgraph and legacy one is disabled."
-#endif
-
-#define DISABLE_NEW_DEPSGRAPH
-
-#include "BLI_utildefines.h"
-#include <cstdlib>
-
-template<typename T>
-class function {
-public:
-	function() {};
-	function(void *) {}
-	operator bool() const { return false; }
-	bool operator== (void *) { return false; }
-
-	template<typename T1>
-	void operator() (T1) {
-		BLI_assert(!"Should not be used");
-	}
-};
-
-class Wrap {
-public:
-	Wrap() {}
-	template <typename T>
-	Wrap(T /*arg*/) {}
-};
-
-template <typename T>
-void *function_bind(T func,
-                    Wrap arg1 = Wrap(),
-                    Wrap arg2 = Wrap(),
-                    Wrap arg3 = Wrap(),
-                    Wrap arg4 = Wrap(),
-                    Wrap arg5 = Wrap(),
-                    Wrap arg6 = Wrap(),
-                    Wrap arg7 = Wrap())
-{
-	BLI_assert(!"Should not be used");
-	(void)func;
-	(void)arg1;
-	(void)arg2;
-	(void)arg3;
-	(void)arg4;
-	(void)arg5;
-	(void)arg6;
-	(void)arg7;
-	return NULL;
-}
-
-#define _1 Wrap()
-#define _2 Wrap()
-#define _3 Wrap()
-#define _4 Wrap()
-
-#endif