Merge remote-tracking branch 'kraxel/roms.1' into staging

# By Gerd Hoffmann
# Via Gerd Hoffmann
* kraxel/roms.1:
  roms: add support for building sgabios
  roms: enable parallel seabios / seavgabios builds
  roms: enable ipxe cross builds
  roms: add rules to build slof
  roms: rewrite scripts/refresh-pxe-roms.sh
  roms: parallel ipxe builds
  roms: build lgplvgabios isavga variant
  roms: enable parallel builds for 'make lgplvgabios'
  roms: add 'make clean'

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