[Ohrrpgce] SVN: teeemcee/9543 scons: print an error message if a popen'ed program like fbc fails

[subversion at HamsterRepublic.com]

teeemcee
2017-10-03 05:54:42 -0700 (Tue, 03 Oct 2017)
276
scons: print an error message if a popen'ed program like fbc fails

Previously it didn't actually check the return code, only whether something
was printed to stderr. fbc doesn't use stderr

(Backported from wip at r9527, without the accidental change to game.bas in that commit)
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U   rel/dwimmercrafty/ohrbuild.py