Only link the .dSYM file if it's out of date
Only link the .dSYM file if it's out of date

Everything else we do each time script/create-dist is run. But this step
takes so long, and is so easy to skip when possible, that it makes sense
to special-case it.

paulcbetts/libchromiumcontent,deepak1556/libchromiumcontent,electron/libchromiumcontent,atom/libchromiumcontent,adamjgray/libchromiumcontent,atom/libchromiumcontent,electron/libchromiumcontent,hokein/libchromiumcontent,zhanggyb/libchromiumcontent,eric-seekas/libchromiumcontent,synaptek/libchromiumcontent,adamjgray/libchromiumcontent,zhanggyb/libchromiumcontent,bbondy/libchromiumcontent,paulcbetts/libchromiumcontent,bbondy/libchromiumcontent,synaptek/libchromiumcontent,brave/libchromiumcontent,jlord/libchromiumcontent,eric-seekas/libchromiumcontent,brave/libchromiumcontent,jlord/libchromiumcontent,hokein/libchromiumcontent,deepak1556/libchromiumcontent