[libc++] Add the version header to all headers.
Some headers which require the version header depend on other headers to
provide it. Include the version header in all top-level headers to make
sure a header cleanup can't remove the version header.
Note this doesn't add the version header to the c headers.
Reviewed By: #libc, Quuxplusone, ldionne
Differential Revision: https://reviews.llvm.org/D116172
NOKEYCHECK=True
GitOrigin-RevId: bd6e6846e7f431e9d84b1f257d4a0c8ddeac4fe2
diff --git a/include/condition_variable b/include/condition_variable
index 0569e22..ecec3ea 100644
--- a/include/condition_variable
+++ b/include/condition_variable
@@ -109,6 +109,7 @@
#include <__config>
#include <__mutex_base>
#include <memory>
+#include <version>
#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#pragma GCC system_header