buildpkg.packaging.solaris: really look for arch specific depend file
Extend gnu symlink functionality

This makes the gnu symlink functionality an integrated part of the
install function.
The interface is now the variable gnu_link_progs which when defined
triggers the automatic symlinking.
newpkg: style cleanup
buildpkg.functions: output configure command for log purposes
buildpkg.functions: style cleanup in generic_install()
buildpkg.packaging.solaris: fixup add_file()
buildpkg.packaging.solaris: correct comment for add_proto()