[PATCH] PPC64 enable with-tls

[Roland McGrath]

> This patch enables --with-tls for powerpc64. It requires the binutils
> form cvs head as of 2003/02/14 to compile and link correctly. 

Are there any broken binutils versions for which your configure check will
succeed but the code will not work right?  If so, we would ideally like to
have the configure check fail for those binutils versions as it does for a
binutils with no TLS support at all.