Dropped 'pgperf'

pgperf was the customized verion of GNU gperf that came with LambdaMOO.
GNU gperf has supported case-insensitive lookup tables since 2002, and
pgperf didn't compile anymore anyways, due to its reliance on varargs.h
which is no longer supported.

[Note: this change was modified to work with C instead -- Kenny Root]
Merge pull request #2 from kruton/no-pgperf

Dropped 'pgperf'