Specifically, several of the git setup scripts defined a function
named "egrep-q". This almost always works, but I happened to have
an install of git on windows/cygwin that gave the error:
`egrep-q': not a valid identifier
I always thought hyphens were allowed in script identifiers (and
usually they are), but apparently sometimes they are not. (See
for example
https://stackoverflow.com/questions/2821043/allowed-characters-in-linux-environment-variable-names).
This provides an easy fix by replacing egrep-q with egrep_q.
