#include <test_macros.h> in all the regex tests, and remove all mentions of __cpluplus (use TEST_STD_VERS and/or XFAIL instead). No functional change

llvm-svn: 267567
diff --git a/libcxx/test/std/re/re.alg/re.alg.replace/test1.pass.cpp b/libcxx/test/std/re/re.alg/re.alg.replace/test1.pass.cpp
index 9fd84fd..13cc8f2 100644
--- a/libcxx/test/std/re/re.alg/re.alg.replace/test1.pass.cpp
+++ b/libcxx/test/std/re/re.alg/re.alg.replace/test1.pass.cpp
@@ -22,6 +22,7 @@
 #include <regex>
 #include <cassert>
 
+#include "test_macros.h"
 #include "test_iterators.h"
 
 int main()