yp*: fix -fno-common build

This is mostly two problems spread out far and wide:
- ypldap_process should be declared properly
- debug is defined differently in many programs

For the latter, just extern it and define it everywhere that actually needs
it. This mostly works out nicely for ^/libexec/ypxfr, which can remove the
assignment at the beginning of main in favor of defining it properly.

-fno-common will become the default in GCC10/LLVM11.

MFC after:	3 days

1 files changed, 2 insertions, 0 deletions

diff --git a/usr.sbin/rpc.ypxfrd/ypxfrd_main.c b/usr.sbin/rpc.ypxfrd/ypxfrd_main.c
index 62420a48c0a9..412190c9ebe9 100644
--- a/usr.sbin/rpc.ypxfrd/ypxfrd_main.c
+++ b/usr.sbin/rpc.ypxfrd/ypxfrd_main.c
@@ -78,6 +78,8 @@ static int _rpcfdtype;
 
 extern int _rpcsvcstate;	 /* Set when a request is serviced */
 
+int debug;
+
 char *progname = "rpc.ypxfrd";
 char *yp_dir = "/var/yp/";