adding python-dev to build dependencies

1 job from firefox in 17 minutes 4 seconds (queued for 3 seconds)
Status Job ID Name Coverage
  Build Firefox
failed #588
build-firefox

17:04

 
Name Stage Failure
failed
build-firefox Build Firefox
debian/rules:204: recipe for target 'stamps/configure-browser' failed
make[2]: Leaving directory '/builds/libregeekingkid/hamara-packages/packages/firefox'
make[1]: *** [build-arch] Error 2
debian/rules:333: recipe for target 'build-arch' failed
make[1]: Leaving directory '/builds/libregeekingkid/hamara-packages/packages/firefox'
debian/rules:333: recipe for target 'build' failed
make: *** [build] Error 2
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
ERROR: Job failed: exit code 1