Implement #491549: On Windows, always use the native API for character set

Implement #491549: On Windows, always use the native API for character set

2007-11-26  Tor Lillqvist  <tml@novell.com>

	Implement #491549: On Windows, always use the native API for
	character set conversions instead of GNU libiconv. Almost all
	codesets supported by GNU libiconv exist as Windows codepages.
	One missing feature is the "C99" and "JAVA" pseudo codesets, but I
	doubt that is worth worrying about.

	* glib/win_iconv.c: New file. iconv() implementation for
	Windows. Placed in the public domain by Yukihiro Nakadaira
	<yukihiro.nakadaira@gmail.com>. From
	http://yukihiro.nakadaira.googlepages.com/win_iconv.zip, his
	2007-11-17 version.

	* glib/gconvert.c: Include win_iconv.c on Windows.

	* configure.in: Bypass iconv checks on Windows.

svn path=/trunk/; revision=5937