Removing GNATS categories

[Martin v. Loewis]

The current GCC GNATS installation has a number of categories that
haven't been used so far, despite the 145 reports that we already
have. I propose to remove them, before anybody uses them. The most
useless ones are

gc
host
profiling

I'd also like to ban the lib* categories, on the basis that they could
go with their front-ends

libf2c
libgcc
libobjc
libobjc
libstdc++

With the reduced list, people won't get so confused about how to file
a bug report. Just how often does it happen that somebody says she has
a problem with libgcc - it would rather come out as a problem with
exception handling, or a missing _divdi3 function.

Opinions? I'd take "no feedback" as "accepted unopposed" :-)

Regards,
Martin

P.S. This should not be taken as criticism of whoever originally
created these categories. It was a good starting point, and the change
now won't be the last time that we have to adjust the structure of
this based on actual user needs.