[libc++] Remove _LIBCPP_BUILDING_XXX macros, which are redundant since _LIBCPP_BUILDING_LIBRARY

Summary: As suggested by Marshall in https://reviews.llvm.org/D49914

Reviewers: mclow.lists, EricWF

Subscribers: christof, dexonsmith, cfe-commits

Differential Revision: https://reviews.llvm.org/D50008

git-svn-id: https://llvm.org/svn/llvm-project/libcxxabi/trunk@338475 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/src/stdlib_exception.cpp b/src/stdlib_exception.cpp
index a8f71ab..6c09102 100644
--- a/src/stdlib_exception.cpp
+++ b/src/stdlib_exception.cpp
@@ -8,7 +8,6 @@
 //===----------------------------------------------------------------------===//
 
 #define _LIBCPP_BUILDING_LIBRARY
-#define _LIBCPP_BUILDING_NEW
 #include <new>
 #include <exception>
 
diff --git a/src/stdlib_new_delete.cpp b/src/stdlib_new_delete.cpp
index 0e85f6a..686ad07 100644
--- a/src/stdlib_new_delete.cpp
+++ b/src/stdlib_new_delete.cpp
@@ -9,7 +9,6 @@
 // This file implements the new and delete operators.
 //===----------------------------------------------------------------------===//
 
-#define _LIBCPP_BUILDING_NEW
 #define _LIBCPP_BUILDING_LIBRARY
 #include "__cxxabi_config.h"
 #include <new>