A workaround in r238563 was for makes (notably bmake) without the internal knowledge that "cd" is a shell's built-in.  Such makes may attempt to exec() "cd" that in turn will fail on systems that lack the "cd" executable.
A workaround in r238563 was for makes (notably bmake) without the
internal knowledge that "cd" is a shell's built-in.  Such makes
may attempt to exec() "cd" that in turn will fail on systems that
lack the "cd" executable.

Reworked this by eliminating the root cause.

Submitted by:	Simon Gerraty <sjg@juniper.net>

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