chrpath 0.16 changes for Solaris support

[Rainer Orth]

I've just tried to build chrpath 0.16 on Solaris 10/x86 since our
currently installed version 0.13 cannot deal with 64-bit objects.  Doing
so, I ran into one problem:

protos.h unconditionally includes <byteswap.h>, which seems to be a
Linuxism and is certainly missing on Solaris.  I'm using
<sys/byteorder.h> instead which has similar functionality.

The following patch adds a check for the header files and maps from the
<byteswap.h> bswap_<N> functions to their <sys/byteorder.h>
equivalents.  It allowed chrpath to build and pass make check.

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Running make install, I noticed that a couple of files get installed
into $prefix/doc/chrpath-0.16.  Again, this seems to be a Linuxism; the
contents of that directory is pretty much useless to almost everyone but
developers.  Maybe you could add a way to make this optional?

Thanks.
        Rainer

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Rainer Orth, Center for Biotechnology, Bielefeld University