--enable-lsb configure option

[Mental-users]

I'd like to see a --with-lsb option for configure which
yields an LSB-friendly build configuration.

The full LSB specification is available on the LSB site
(http://www.freestandards.org/spec/), but for our
purposes it mainly just requires installation into /opt
and not assuming the presence of certain libraries.

Essentially:

 - --prefix=/opt

 - statically linking with all C++ libraries (most
aren't guaranteed to be present by LSB, and we also
have to consider C++ ABI issues)

 - statically linking with libgc, and liblcms and any
other libraries which LSB doesn't guarantee the presence of

This is such low-hanging fruit I think it'd be a shame
not to support it. For now, I'm assigning the RFE to
myself so it doesn't get forgotten, but if anyone else
wants to pick it up before I get to it (I've got a pile
of other work to get through), please be my guest.

[Mental-users (mental-users)]

Whoops, that should be --prefix=/opt/inkscape

[Mental-users (mental-users)]

Looking at the autoconf documentation, --enable-lsb is
probably a more appropriate name for the option than --with-lsb

[Mental-users (mental-users)]

I've comitted a sort of stub implementation to trunk now; it
does the prefix bit, but doesn't force the necessary
libraries to be statically linked yet -- I still need to
figure out the best way to do the latter. (advice wanted)