libpayload: Implement strlcpy

Change-Id: Ibd339957690afe2cded46895c3088eba87f0ffd1
Signed-off-by: Patrick Georgi <patrick.georgi@secunet.com>
Reviewed-on: http://review.coreboot.org/85
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

payloads/libpayload/libc/Makefile.inc

@@ -33,6 +33,7 @@ libc-$(CONFIG_LIBC) += memory.c ctype.c ipchecksum.c lib.c
 libc-$(CONFIG_LIBC) += rand.c time.c exec.c
 libc-$(CONFIG_LIBC) += readline.c getopt_long.c sysinfo.c
 libc-$(CONFIG_LIBC) += args.c strings.c
+libc-$(CONFIG_LIBC) += strlcpy.c
 
 # should be moved to coreboot directory
 libc-$(CONFIG_LAR) += lar.c