#312 Small changes in porting to Mac OS X

[Andrew McNabb]

I've found two minor changes so far that will be needed
for porting grip to Mac OS X.

1) In src/grip.h, the MAILER macro is defined for
various platforms. Mac OS X / Darwin should be added
to the list. They use /usr/sbin/sendmail.

2) A system header file has a struct with a field named
VERSION. It appears to me that VERSION is defined as a
macro in grip's configure scripts. The redefinition
causes parse errrors when gcc processes the Mac OS X
header file. I'm guessing the VERSION in grip should
be renamed to GRIPVERSION or something like that to
interoperate better with Mac OS X.

Let me know if there's anything I can do to help.

[Solbu]

A patch would be nice. :-)