Add the BSD sys_signame array.

Signed-off-by: Thorsten Glaser <tg@mirbsd.org>
diff --git a/libc/Android.mk b/libc/Android.mk
index b68d4f8..506dac5 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -52,6 +52,7 @@
 	unistd/siginterrupt.c \
 	unistd/siglist.c \
 	unistd/signal.c \
+	unistd/signame.c \
 	unistd/sigsetmask.c \
 	unistd/sigsuspend.c \
 	unistd/sigwait.c \