Please give back gnome-builder on mips

[Jeremy Bicha <jbicha@debian.org>]

One of gnome-builder's build tests too long on mips. I increased the
timeout for that test to 650 seconds and generally that test has only
been taking about 50 seconds since then. I could ask upstream to bump
the timeout more but I think 650 is enough for us (usually).

gb gnome-builder_3.30.3-1 . mips

References
---------------
https://buildd.debian.org/status/package.php?p=gnome-builder
https://buildd.debian.org/status/logs.php?pkg=gnome-builder&arch=mips

Thanks,
Jeremy Bicha