xbps-src: revbump for version 34.
common/global-defs.sh: increase XBPS_SRC_REQ to 34.
Revert "dialog: update to 1.2-20121230."

This reverts commit 77cb27f8c5e29f4e9a4ce1ff6bc02b29e1069a3a.

The upstream tarball is fucked up completely.