Thread: pgsql: Fix initdb to reject a relative path for -X (--xlogdir) argument.

Log Message:
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Fix initdb to reject a relative path for -X (--xlogdir) argument.  This
doesn't work, and the real reason why not is it's unclear where the path
is relative to (initdb's CWD, or the data directory?).  We could make an
arbitrary decision, but it seems best to make the user be unambiguous.
Per gripe from Devrim.

Modified Files:
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    pgsql/src/bin/initdb:
        initdb.c (r1.155 -> r1.156)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/initdb/initdb.c?r1=1.155&r2=1.156)