4.14: Gnu dbm

Here's the fixes for RS/6000's:

apply this to testgdbm.c:
158c158
<   char opt;
---
>   int opt;
166c166
<   while ((opt = getopt (argc, argv, "rn")) != -1)
---
>   while ((opt = getopt (argc, argv, "rn")) != EOF)

Apply this to systems.h:
111a112,114
> #ifdef RS6000
> #pragma alloca
> #else
112a116
> #endif

To compile, edit the Makefile.  Set CC to bsdcc (see /usr/lpp/bos/bsdport
if you don't have 'bsdcc' on your system) and set CFLAGS to -DRS6000 and
whatever options (-g, -O) you prefer.  Don't define SYSV.