[patch]: dllwrap ported for x64 and support for new --[no-]leading-underscore option

[Kai Tietz <ktietz70 at googlemail dot com>]

Hello all,

To make port of binutils tools a bit more complete for x64 Windows,
the dllwrap tool had some issues this patch fixes. Also it allows now
the --[no-}leading-underscore options, too. I am not sure, if this
tool is very useful for people in general, but I see that its main-use
seems to be for x86 cygwin and mingw toolchains. I extended it, so
that it can make a difference between different architectures. This is
mainly necessary for the @<n> post-fix, which has a meaning just for
x86 AFAIU.

2009-10-29  Kai Tietz  <kai.tietz@onevision.com>

	* dllwrap.c (is_leading_underscore): New variable.
	(host_type): New enum type.
	(which_host): New variable.
	(usage): Add new options --no-leading-underscore
	and --leading-underscore.
	(long_options): Likewise.
	(OPTION_NO_LEADING_UNDERSCORE): New define.
	(OPTION_LEADING_UNDERSCORE): Likewise.
	(main): Initialize which_host, pass new options
	to dlltool, do underscoring dependent to
	is_leading_underscore, and do '@12' decoration
	only for x86.

Tested for x86_64-pc-mingw32, i686-pc-mingw32, and for i686-cygwin. Ok
for apply?

Cheers,
Kai

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