split internal lock API out of libc.h, creating lock.h

this further reduces the number of source files which need to include
libc.h and thereby be potentially exposed to libc global state and
internals.

this will also facilitate further improvements like adding an inline
fast-path, if we want to do so later.

1 files changed, 1 insertions, 0 deletions

diff --git a/src/time/__tz.c b/src/time/__tz.c
index 6f5257fe..51e66514 100644
--- a/src/time/__tz.c
+++ b/src/time/__tz.c
@@ -5,6 +5,7 @@
 #include <string.h>
 #include <sys/mman.h>
 #include "libc.h"
+#include "lock.h"
 
 long  __timezone = 0;
 int   __daylight = 0;