ports-10.12_x86_64-builder is broken

[aeiouaeiouaeiouaeiouaeiouaeiou]

After MacPorts 2.10.3 update the macOS Sierra builder cannot to destroot 
files, whether the build is successful or not: 
https://build.macports.org/builders/ports-10.12_x86_64-builder/builds/289149/steps/install-port/logs/stdio


DEBUG: checking for mtree violations
Error: Failed to destroot ffmpeg.
DEBUG: Error code: NONE
DEBUG: Backtrace:
     while executing
"fs_clone_capable $destroot"
     (procedure "portdestroot::destroot_finish" line 229)
     invoked from within
"$postrun $targetname"
DEBUG: dropping privileges: euid changed to 502, egid changed to 501.
Error: See 
/opt/local/var/macports/logs/_opt_bblocal_var_buildworker_ports_build_ports_multimedia_ffmpeg/ffmpeg/main.log 
for details.
Error: Follow https://guide.macports.org/#project.tickets if you believe 
there is a bug.
Error: Processing of port ffmpeg failed

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