add two missing rust options

[m1-debian] / mesa-debian / watch

#git=git://anongit.freedesktop.org/mesa/mesa
version=3
opts="uversionmangle=s/-rc/~rc/,dversionmangle=s/\+repack//,pgpsigurlmangle=s/$/.sig/,pasv" \
https://mesa.freedesktop.org/archive/mesa-(.*)\.tar\.xz