KDE4: change eventLoopType enum to glib bool

Just check for glib; it's the default in later Qt4 versions on unix.

(cherry picked from commit 516a8dedac9c3cb77cd26a740cf793b1cab920d0)

Change-Id: Iacf688c09b4e70955302c8c79d189ec2fd7eacda
Reviewed-on: https://gerrit.libreoffice.org/8707
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>