More -Wmissing-variable-declarations fixes.

In addition to adding `static' where possible:

- bin/date: Move `retval' into extern.h to make it visible to date.c.
- bin/ed: Move globally used variables into ed.h.
- sbin/camcontrol: Move `verbose' into camcontrol.h and fix shadow warnings.
- usr.bin/calendar: Remove unneeded variables.
- usr.bin/chat: Make `line' local instead of global.
- usr.bin/elfdump: Comment out unneeded function.
- usr.bin/rlogin: Use _Noreturn instead of __dead2.
- usr.bin/tset: Pull `Ospeed' into extern.h.
- usr.sbin/mfiutil: Put global variables in mfiutil.h.
- usr.sbin/pkg: Remove unused `os_corres'.
- usr.sbin/quotaon, usr.sbin/repquota: Remove unused `qfname'.

1 files changed, 2 insertions, 0 deletions

diff --git a/bin/date/extern.h b/bin/date/extern.h
index 76b8d5e16105..91aeab2e07e1 100644
--- a/bin/date/extern.h
+++ b/bin/date/extern.h
@@ -30,4 +30,6 @@
  * $FreeBSD$
  */
 
+extern int retval;
+
 int	netsettime(time_t);