replace library time handling functions

mktime, tzset, asctime, ctime, gmtime, localtime, strftime
with zoneinfo implementations in src/commands/zoneinfo, referenced
from src/lib/stdtime/Makefile.in.

lib/stdtime/Makefile.in

@@ -0,0 +1,14 @@
+# Makefile for lib/stdtime.
+
+Z=../../commands/zoneinfo
+
+CFLAGS="-O -D_MINIX -D_POSIX_SOURCE -D__USG -I$Z"
+
+LIBRARIES=libc
+libc_FILES="
+	$Z/asctime.c
+	$Z/localtime.c
+	$Z/strftime.c
+	"
+		
+TYPE=both