[Fluxus] segfault on osx

[nik gaffney]

looks like the changes introduced with the recent PLT update has
introduced some problems on osx (or in my environment at least..)

I get a 'Seg fault (internal error) at 0x4' which has popped up a few
times previously, but in this case i tried tracking it down to a
specific change. discovering how 'git bisect' works was a help in
narrowing down the most recent 'good' version.

so, rev 29f3e59e50a3a5372738527b81365607e35ebeea 'works for me', but
anything later causes a segfault.

git bisect start
# bad: [c9db7dfa4d119b8ae8330b3b8eebe4cfcdf1a4f7] osx app plt 4.1.5
fixes added new stxclass module required by plt 4.1.5
git bisect bad c9db7dfa4d119b8ae8330b3b8eebe4cfcdf1a4f7
# good: [9fb8fe69c4f3533d1ce9de0d70266e6d30c90747] Merge branch 'master'
of ssh://nebogeo@git.sv.gnu.org/srv/git/fluxus
git bisect good 9fb8fe69c4f3533d1ce9de0d70266e6d30c90747
# good: [29f3e59e50a3a5372738527b81365607e35ebeea] fixed fluxa osx app
git bisect good 29f3e59e50a3a5372738527b81365607e35ebeea
# bad: [4bfe6d3d2cad9d01e1f00a0d87169d96183b7bf6] removed lots of
unnecessary plt modules from osx app making the filesize smaller
git bisect bad 4bfe6d3d2cad9d01e1f00a0d87169d96183b7bf6
# bad: [4dc6ebf3a0376216260b0cc3e8f8db07ac042ccc] Flipped row order in
PNGLoader::Save to match ::Load - fluxus images have 0,0 in the lower
left hand corner and 1,1 in the upper right. (cherry picked from commit
343e6775ef61b4cd1cee06212ac85b10be5c2244)
git bisect bad 4dc6ebf3a0376216260b0cc3e8f8db07ac042ccc