DBGHELP: portability fix

[Hans Leidekker]

There's a configure check for regex.h and dbghelp uses it to
conditionally include regex.h but then it goes on to use regex
types and functions unconditionally. This patch fixes that and
with it dbghelp builds on MinGW.

Changelog:
  Protect use of regex types and functions by #ifdef HAVE_REGEX_H.
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