Changes in process spawning break perl system() function

[LRN <lrn1986@gmail.com>]

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How to reproduce:
1) create a shell script (say, /usr/bin/shellscript) containing this:

#!/bin/sh
echo ${0##*/}

2) create a symlink (say, /usr/bin/asymlink) that points to shellscript

3) create a perl script (say, /usr/bin/perlscript) containing this:

#! /usr/bin/perl -w
system '/usr/bin/asymlink';

4) run /usr/bin/perlscript

Expected results:
"asymlink" should be echoed by the shellscript when it is run by perlscript

Actual results:
"shellscript" is echoed instead

This affects 1.7.35.

I've tried various cygwin dll snapshots, everything is fine (symlink name is
echoed) with cygwin1-20150210.dll, cygwin1-20150211.dll breaks things first (a
full DOS path to shellscript is echoed), then from cygwin1-20150215.dll and
onward the target script name is echoed, as described above.

Symlink can be a Cygwin symlink or a native symlink, doesn't matter.

The use-case for this is autoconf wrapper (a shell script) that is being run by
autoreconf (a perl script) and uses the contents of $0 to find different
versions of autoconf, expecting $0 to be something like /usr/bin/autoconf, but
getting things like /usr/share/autotools/ac-wrapper.sh instead.

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