FORTIFY_SOURCE: add strlcpy / strlcat support

Add strlcpy / strlcat support to FORTIFY_SOURCE. This allows
us to do consistency checks on to ensure we don't overflow buffers
when the compiler is able to tell us the size of the buffer we're
dealing with.

Unlike previous changes, this change DOES NOT use the compiler's
builtin support. Instead, we do everything the compiler would
normally do.

Change-Id: I47c099a911382452eafd711f8e9bfe7c2d0a0d22
diff --git a/libc/Android.mk b/libc/Android.mk
index f90520e..06d36fe 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -214,6 +214,8 @@
 	string/__memset_chk.c \
 	string/__strcat_chk.c \
 	string/__strcpy_chk.c \
+	string/__strlcat_chk.c \
+	string/__strlcpy_chk.c \
 	string/__strncat_chk.c \
 	string/__strncpy_chk.c \
 	wchar/wcpcpy.c \