Rebuilt the SRPM on Redhat 6.0.


Some man pages contain @PREFIX@'s.  For instance gnats(7):

----
Administrative  programs  and  programs  internal  to  GNATS  are  kept
in  the   directory   @PRE-
       FIX@/libexec/gnats while those meant for public use are installed in
@PREFIX@/bin.

       @PREFIX@/libexec/gnats contains the programs:
---- (sorry for the mangled mess) ----

Also, gnats-user's setup in spec file is silly.  See:
----
    /usr/sbin/useradd -c "Gnats User" \
       -r -d /usr/share/gnats/gnats-db/gnats-adm/config gnats 2>/dev/null
|| :
    exit 1
----
/usr/share/gnats/gnats-db/gnats-adm/config is the configuration file.
Having this as a home directory is a little silly.

Also, an enhancement request:  On newer system's  - Redhat 6.2 specifically
- UID's used by system accounts have been set to be below 100.  Using this
scheme if possible when setting up the account for gnats would be neat,
too. :)