Log Message:
Update to 2.2.24. Fix MASTER_SITES. Set LICENSE.

	* README: Bumped version

	* configure.in: Bumped version to 2.2.24

	* gmime/gmime-utils.c (charset_convert): If iconv() fails, treat
	conditions where outleft == 0 the same as if we had gotten an
	E2BIG error (e.g. we need to grow the output buffer) so that we
	don't overrun it while appending a '?' placeholder character.

	* configure.in: Simplified configuring of gmime in a
	cross-compilation environment. Make it possible to work-around
	AC_TRY_RUN limitations by copying of target system iconv-detect.h
	and setting ac_cv_have_iconv_detect_h=yes.