[libc++] Replace `#include ""` with `<>` in libcxx/src/. NFCI.
Our best guess is that the two syntaxes should have exactly equivalent
effects, so, let's be consistent with what we do in libcxx/include/.
I've left `#include "include/x.h"` and `#include "../y.h"` alone
because I'm less sure that they're interchangeable, and they aren't
inconsistent with libcxx/include/ because libcxx/include/ never
does that kind of thing.
Also, use the `_LIBCPP_PUSH_MACROS/POP_MACROS` dance for `<__undef_macros>`,
even though it's technically unnecessary in a standalone .cpp file,
just so we have consistently one way to do it.
Differential Revision: https://reviews.llvm.org/D119561
diff --git a/libcxx/src/condition_variable.cpp b/libcxx/src/condition_variable.cpp
index 0ade56b..b17c4cf 100644
--- a/libcxx/src/condition_variable.cpp
+++ b/libcxx/src/condition_variable.cpp
@@ -6,19 +6,21 @@
//
//===----------------------------------------------------------------------===//
-#include "__config"
+#include <__config>
#ifndef _LIBCPP_HAS_NO_THREADS
-#include "condition_variable"
-#include "thread"
-#include "system_error"
-#include "__undef_macros"
+#include <condition_variable>
+#include <thread>
+#include <system_error>
#if defined(__ELF__) && defined(_LIBCPP_LINK_PTHREAD_LIB)
-#pragma comment(lib, "pthread")
+# pragma comment(lib, "pthread")
#endif
+_LIBCPP_PUSH_MACROS
+#include <__undef_macros>
+
_LIBCPP_BEGIN_NAMESPACE_STD
// ~condition_variable is defined elsewhere.
@@ -90,4 +92,6 @@
_LIBCPP_END_NAMESPACE_STD
+_LIBCPP_POP_MACROS
+
#endif // !_LIBCPP_HAS_NO_THREADS
