-mcpu=powerpc assumes certain powerpc and will create wrong code if the
default cpu is not compatible with with -mcpu=powerpc. This is the case
on softfloat toolchains for instance.
This patch removes the -mcpu= state from cflags and the default cpu will
be used.
http://lists.alioth.debian.org/pipermail/pkg-firebird-general/2010q2/001932.html
2. Cleaned up most of platform-specific additions - most opf them are not needed any more,
still causing troubles when porting. It will be better to re-add that which are really needed.
3. Do not build gds_drop utility on platforms where not needed.
