nscd: drop selinux/flask.h include

Building nscd w/selinux enabled yields a warning which yields an error:
In file included from selinux.c:32:0:
/usr/include/selinux/flask.h:5:2: error:
 #warning "Please remove any #include's of this header in your source code."

I've done just that and it builds cleanly with libselinux-2.4.

ChangeLog

@@ -1,3 +1,7 @@
+2015-07-08  Mike Frysinger  <vapier@gentoo.org>
+
+	* nscd/selinux.c: Delete selinux/flask.h include.
+
 2015-07-08  Mike Frysinger  <vapier@gentoo.org>
 
 	[BZ #18641]

nscd/selinux.c

@@ -29,7 +29,6 @@
 #include <unistd.h>
 #include <sys/prctl.h>
 #include <selinux/avc.h>
-#include <selinux/flask.h>
 #include <selinux/selinux.h>
 #ifdef HAVE_LIBAUDIT
 # include <libaudit.h>