libassuan: Update to version 2.5.5

libassuan: Update to version 2.5.5

- Update from 2.5.4 to 2.5.5
- Update of rootfile
- Changelog
    Release 2.5.5.
	Support Unicode when starting servers on Windows.
	  * src/assuan-socket.c (utf8_to_wchar): Rename to
	  (_assuan_utf8_to_wchar): this and give global scope.
	  * src/system-w32.c (__assuan_spawn): Use CreateProcessW.
	m4: Update with newer autoconf constructs.
	  * src/libassuan.m4: Replace AC_HELP_STRING to AS_HELP_STRING.
	build: Update to newer autoconf constructs.
	  * configure.ac: Use AC_CONFIG_HEADERS instead of AM_CONFIG_HEADER.
	  Use AC_USE_SYSTEM_EXTENSIONS instead of AC_GNU_SOURCE.
	  Use AS_HELP_STRING instead of AC_HELP_STRING.
	  (AC_TYPE_SIGNAL): Remove.
	  (AC_DECL_SYS_SIGLIST): Remove.
	  * m4/Makefile.am (EXTRA_DIST): Update.
	  * m4/gnupg-pth.m4: Remove.
	  * m4/onceonly.m4: Remove.
	  * m4/socklen.m4: Update from gnulib.
	  * m4/libtool.m4: Update from libgpg-error.
	  * m4/gpg-error.m4: Update from libgpg-error.
	Fix crash when logging.
	  * src/assuan-logging.c (_assuan_log_control_channel): Use gpgrt_malloc.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>