#2 Clobber fix for RPC server

[Mark Brown]

This fixes another PowerPC compile failure, though depending
on the whim of GCC I guess it could show up anywhere.
The failure is:

| gcc -DPACKAGE=\"freedce\" -DVERSION=\"1.1.0.7\" -DHAVE_DLFCN_H=1 -DYYTEXT_POINTER=1
-DHAVE_LIBPTHREAD=1 -DHAVE_FEATURES_H=1 -DHAVE_SYS_CDEFS_H=1 -D_REENTRANT=1
-D_GNU_SOURCE=1 -DDEBUG=1 -DENABLE_DCOM=1 -DHAVE_GETTIMEOFDAY=1
-DHAVE_SOCKET=1 -DPROT_NCACN=1 -DPROT_NCADG=1 -DNAF_IP=1 -DUSE_LOOPBACK=1 -I.
-I. -I../include -g -Wall -W -O -pipe -Werror -DNCK -D_POSIX_SOURCE=1 -I../ncklib/include
-I../ncklib/include/linux-gnu -c rpcdsliv.c
| cc1: warnings being treated as errors
| rpcdsliv.c: In function `sliv_task2':
| rpcdsliv.c:223: warning: variable `have_db_lock' might be clobbered by
| `longjmp' or `vfork'

which is down to the setjmp()/longjmp() exception handling
implementation. The patch fixes this by marking have_db_lock
as DO_NOT_CLOBBER.

[Mark Brown]

The patch