poudriere: devel/llvm39: runaway_process

[Craig Leres]

My poudriere build servers have been unable to build devel/llvm39 ever 
since some ports changed from llvm37 (January 17th?) The error is 
runaway_process and this happens during the package phase. It looks like 
pkg-static spins for one hour at which point poudriere gives up on it. 
Yesterday I raised max_execution_time for package on one build server to 
2 hours which did not help.  My three servers are all at 
10.3-RELEASE-p16 and I'm attempting to build packages for the same version.

I'm still able to build llvm37 ok. Since it takes ~2 hours for the 
failure to occur I'm hoping for ideas on how to diagnose this.

		Craig