WIN32 exceptions patch

[Jeremy Bettis]

This patch is relative to the gdb 5.2.1-1 from mingw.org, but the mingw
developer Earnie Boyd (earnie@users.sourceforge.net) insisted I send this to
you.


When debugging a program that uses windows SEH gdb stops the program even if
the inferior's exception handler catches the exception.  I have added a new
set option, "set mapexceptionstosignals off" that will cause gdb to
completely ignore WIN32 exceptions. This is similar to the feature "set
signal-exceptions 4" in the Apple Openstep version of gdb 4.15.3.
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