Version bumps + couple of QA fixes

mate-desktop-1.5.7: Version bump + fix QA issues

Version bump
Fix "QA Notice: Unrecognized configure options"

mate-window-manager-1.5.4: Version bump + bump EAPI + fix QA issues

Version bump
Update ebuild to EAPI 5
Fix "QA Notice: USE Flag 'gtk3' not in IUSE"