MSVC: compat: implement gmtime_r()
Technically, there's no need for gmtime_r() because Windows gmtime() is
thread-safe already, but we're using these thread-safe versions
almost everywhere already.
diff --git a/CMakeModules/UseCompat.cmake b/CMakeModules/UseCompat.cmake
index 08c29a2..c1befd7 100644
--- a/CMakeModules/UseCompat.cmake
+++ b/CMakeModules/UseCompat.cmake
@@ -53,6 +53,7 @@
check_symbol_exists(realpath "stdlib.h" HAVE_REALPATH)
check_symbol_exists(localtime_r "time.h" HAVE_LOCALTIME_R)
+ check_symbol_exists(gmtime_r "time.h" HAVE_GMTIME_R)
check_symbol_exists(strptime "time.h" HAVE_STRPTIME)
check_symbol_exists(mmap "sys/mman.h" HAVE_MMAP)
check_symbol_exists(dirname "libgen.h" HAVE_DIRNAME)