[Lilypond-auto] Issue 4364 in lilypond: Patch: Allow ImageMagick's compare to exit with status 1

[lilypond]

Status: Started
Owner: address@hidden
Labels: Type-Enhancement Patch-new

New issue 4364 by address@hidden: Patch: Allow ImageMagick's compare to exit  
with status 1
https://code.google.com/p/lilypond/issues/detail?id=4364

Allow ImageMagick's compare to exit with status 1

Apparently Ubuntu 15.04 has a version of "compare" that cannot be  
easily
persuaded to return anything but exit status 1 (which indicates
dissimilar images but no actual error condition) so we allow this in
script/build/output-distance.py in order to keep "make check" from
failing.

This patch is somewhat artless but does the trick.

http://codereview.appspot.com/231300043

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