Enable warnings for maintainer mode. Fix warnings.
* configure.ac: Apply GCC specific options for maintainer mode. * src/assuan-handler.c, src/assuan-logging.c: Fix warnings. * src/assuan-socket-connect.c, src/assuan-socket.c: Likewise. * src/assuan-uds.c, src/debug.c, src/system-posix.c: Likewise. * src/system-w32.c, src/system.c: Likewise. * tests/socks5.c (main): Use int for the check of the value 65535.
The code in configure.ac is from libgpg-error master.
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>