[2.2] Do not install at.h when glibc header is present #414
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The at.h header conflicts with at.h distributed with glibc. Therefore, install the header only on systems where glibc isn't distributed by default. We still want to distribute it in the tarball, however.
As a side note, our at.h is probably relevant only for NetBSD presently, which is the one non-Linux OS where an appletalk kernel module is being kept alive.