test: Add test for strlcat

This test is adapted from glibc, which is very concerned about alignment.
It also tests strlcpy by dependency.

Signed-off-by: Sean Anderson <seanga2@gmail.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
diff --git a/test/lib/Makefile b/test/lib/Makefile
index a30f615..aa2e66b 100644
--- a/test/lib/Makefile
+++ b/test/lib/Makefile
@@ -11,6 +11,7 @@
 obj-$(CONFIG_CONSOLE_RECORD) += test_print.o
 obj-$(CONFIG_SSCANF) += sscanf.o
 obj-y += string.o
+obj-y += strlcat.o
 obj-$(CONFIG_ERRNO_STR) += test_errno_str.o
 obj-$(CONFIG_UT_LIB_ASN1) += asn1.o
 obj-$(CONFIG_UT_LIB_RSA) += rsa.o