Eliminate _LIBCPP_EQUAL_DELETE in favor of =delete.

All supported compilers have supported `=delete` as an extension
in C++03 mode for many years at this point.

Differential Revision: https://reviews.llvm.org/D109942

Author: Arthur O'Dwyer

libcxx/include/__config

@@ -831,12 +831,6 @@ typedef unsigned int   char32_t;
 #  define _LIBCPP_DEFAULT = default;
 #endif
 
-#ifdef _LIBCPP_CXX03_LANG
-#  define _LIBCPP_EQUAL_DELETE
-#else
-#  define _LIBCPP_EQUAL_DELETE = delete
-#endif
-
 #ifdef __GNUC__
 #  define _LIBCPP_NOALIAS __attribute__((__malloc__))
 #else

libcxx/include/__mutex_base

@@ -96,8 +96,8 @@ public:
     ~lock_guard() _LIBCPP_THREAD_SAFETY_ANNOTATION(release_capability()) {__m_.unlock();}
 
 private:
-    lock_guard(lock_guard const&) _LIBCPP_EQUAL_DELETE;
-    lock_guard& operator=(lock_guard const&) _LIBCPP_EQUAL_DELETE;
+    lock_guard(lock_guard const&) = delete;
+    lock_guard& operator=(lock_guard const&) = delete;
 };
 
 template <class _Mutex>

libcxx/include/__tree

@@ -738,9 +738,9 @@ public:
     }
 
 private:
-  ~__tree_node_base() _LIBCPP_EQUAL_DELETE;
-  __tree_node_base(__tree_node_base const&) _LIBCPP_EQUAL_DELETE;
-  __tree_node_base& operator=(__tree_node_base const&) _LIBCPP_EQUAL_DELETE;
+  ~__tree_node_base() = delete;
+  __tree_node_base(__tree_node_base const&) = delete;
+  __tree_node_base& operator=(__tree_node_base const&) = delete;
 };
 
 template <class _Tp, class _VoidPtr>
@@ -753,9 +753,9 @@ public:
     __node_value_type __value_;
 
 private:
-  ~__tree_node() _LIBCPP_EQUAL_DELETE;
-  __tree_node(__tree_node const&) _LIBCPP_EQUAL_DELETE;
-  __tree_node& operator=(__tree_node const&) _LIBCPP_EQUAL_DELETE;
+  ~__tree_node() = delete;
+  __tree_node(__tree_node const&) = delete;
+  __tree_node& operator=(__tree_node const&) = delete;
 };
 
 

libcxx/include/map

@@ -747,10 +747,10 @@ public:
     }
 
 private:
-    __value_type() _LIBCPP_EQUAL_DELETE;
-    ~__value_type() _LIBCPP_EQUAL_DELETE;
-    __value_type(const __value_type& __v) _LIBCPP_EQUAL_DELETE;
-    __value_type(__value_type&& __v) _LIBCPP_EQUAL_DELETE;
+    __value_type() = delete;
+    ~__value_type() = delete;
+    __value_type(const __value_type&) = delete;
+    __value_type(__value_type&&) = delete;
 };
 
 #else