Revert "gdb: disable loading of auto-loaded files"

This reverts commit 5a2f83cd86ce824167fa7ea8e5357c014034ed46.

Turning auto-load off also turns the pretty printer off.

Unfortunately, we must trust to providers of the auto-loaded scripts and
we must be fixing root causes and not treating symptoms.

Related: #1128637
gdb: make gdb aware of the abrt's debuginfo dir

A debuginfo package might ship an auto-loaded gdb script. If abrt
unpacks that package into the abrt's debuginfo cache dir and points gdb
to that directory, gdb refuses to auto-loaded that gdb scripts and
produces a plenty of warning messages that abrt writes to 'backtrace'
file.

The previous solution of this issue was to turn auto-load off completely
but it turned the pretty printer off too.

The correct solution is to add the abrt's debuginfo cache directory to
auto-load safe-path and auto-load scripts-dir settings.

Thanks Jan Kratochvil <jkratoch@redhat.com>

Requires: rhbz#1163339
Resolves: rhbz#1128637

Signed-off-by: Jakub Filak <jfilak@redhat.com>
spec: update the required gdb version

Requires: rhbz#1163339
Related: rhbz#1128637

Signed-off-by: Jakub Filak <jfilak@redhat.com>