Log Message:
Add support for using suse100 with NetBSD/amd64 and COMPAT_LINUX32.

Support is added via the options framework, to use 32-bit packages
must be used "PKG_OPTIONS.suse=compat32", otherwise it will use
the 64-bit packages by default.

Known packages working are opera (does not require any change in Makefile)
and rar-bin.

Tested by some, closes PR pkg/35477 by Michai Chelaru (which provided
a patch more or less than this one).