Removal of -pedantic and -pedantic-errors from acinclude.m4.in

[Alex Zepeda]

I'd like to see those flags removed from acinclude.m4.in.

For whatever reason (like gcc sucking) gcc will trip over system headers
on FreeBSD when -pedantic is used.  This has been the case for a while,
but with the advent of gcc 3.3 these warnings needlessly became errors.

IMO there's no real reason why everyone should be forced to use -pedantic, 
and it can always be specified with CFLAGS or CXXFLAGS if so desired.

- alex