Fix alpha termios.h NL2, NL3 namespace (bug 21268)

[Mike Frysinger]

On 18 Mar 2017 00:34, Joseph Myers wrote:
> sysdeps/unix/sysv/linux/alpha/bits/termios.h defines NL2 and NL3 for
> __USE_MISC || __USE_XOPEN.  These should only be defined for
> __USE_MISC as they are not part of any standard namespace.  This patch
> conditions them accordingly, matching the powerpc version of the
> header (the only other one in glibc that defines these macros).
> 
> Tested (compilation only) with build-many-glibcs.py.

lgtm
-mike
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