Reduce scope of variables
- libwget/bar.c: Likewise
- libwget/console.c: Likewise
- libwget/encoding.c: Likewise
- libwget/hashmap.c: Likewise
- libwget/io.c: Likewise
- libwget/md5.c: Likewise
- libwget/netrc.c: Likewise
- libwget/ssl_gnutls.c: Likewise
- libwget/xml.c: Likewise
- src/job.c: Likewise
- src/plugin.c: Likewise
- libwget/hashfile.c: Include local private.h
- src/host.c: Remove unused find_free_job_context struct
Found by: cppcheck