perl panics with cygwin-1.7.0-31

[Eric Blake]

When I upgraded to 1.7.0-31, I started seeing perl fail with a panic; for 
example:

$ /bin/autom4te --version
panic: MUTEX_UNLOCK (1) [util.c:2580] at /bin/autom4te-2.63 line 93.
autom4te-2.63: need GNU m4 1.4 or later: /usr/bin/m4

Downgrading to 1.7.0-30 fixed things.

-- 
Eric Blake



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