Fix code-path for non AF_INET6

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@38256 72102866-910b-0410-8b05-ffd578937521
Provide NAN constant for Solaris if not available

git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@38257 72102866-910b-0410-8b05-ffd578937521
imor fixup for systems without nstzfile.h


git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/base/trunk@38258 72102866-910b-0410-8b05-ffd578937521
.gitignore files (mostly copied from .cvsignore's)
Check in files generated by ./configure