gzdoom.xml: switch GZDoom from SVN to Git
doom-legacy.xml: added Homepage
arm-chocolate-doom.xml: added --disable-ѕilent-rules

- --disable-ѕilent-rules turns on debugging during 'make'
arm-dep-libvorbis.xml: fix artifact pull from arm-dep-libogg
jobs/Linux: added new ARM jobs for Doom Legacy and EDGE