library placement

[Christoph Hellwig]

There's a three year old patch from Mike in bugzilla that stops
symlimking the libaries into two different directories if they
are in fact not actually different:

	http://oss.sgi.com/bugzilla/show_bug.cgi?id=430

After reviewing it again I don't see the point of having two copies
names for them.

The .so libraries should go into PKG_LIB_DIR (aka /lib in Debian) because
need them at runtime, potentially from tools outside of /usr.  The .a
and .la libraries are purely development ones and should go into
PKG_DEVLIB_DIR (aka /usr/lib in Debian) as we won't ever need them
while running programs.

Given that we're currently working on the xfsprogs 3.0.0 major release
this might be the time to make this change.