Should -with-tls be default? Or should nptl turn it on?

[Enrique Perez-Terron]

libc/configure.in:
   dnl Let the user avoid using TLS.  Don't know why but...
   dnl XXX For now we disable support by default.
   AC_ARG_WITH([tls],
            AC_HELP_STRING([--with-tls],
                           [enable support for TLS]),
	    [usetls=$withval],
	    [usetls=no])

...

   nptl/sysdeps/i386/tls.h:58:3: #error "TLS support is required."

-Enrique