msgctl: fix a bug of No such file or directory

The binary file of msgctl is installed in /opt/ltp/lib/. When execute msgctl,
"pan(23126): execvp of 'msgctl01' (tag msgctl01) failed.  errno:2  No such file or directory"
will be outputed.

The bug is caused by commit 119cf4a626d0a96dd106546987dff276c0e53acb.

Signed-off-by: Peng Haitao <penght@cn.fujitsu.com>
Reviewed-by: Wanlong Gao <gaowanlong@cn.fujitsu.com>
diff --git a/testcases/kernel/syscalls/ipc/Makefile b/testcases/kernel/syscalls/ipc/Makefile
index 69c6e8c..42492db 100644
--- a/testcases/kernel/syscalls/ipc/Makefile
+++ b/testcases/kernel/syscalls/ipc/Makefile
@@ -22,7 +22,7 @@
 
 LIBDIR			:= lib
 FILTER_OUT_DIRS		:= $(LIBDIR)
-LIB			:= $(LIBDIR)/libipc.a
+LIB			:= $(LIBDIR)/libipc.a $(LIBDIR)/libmsgctl.a
 
 $(LIBDIR):
 	mkdir -p "$@"