[Ohrrpgce] SVN: teeemcee/10380 hspeak: delete the partially-written .hs file if an error occurs

[subversion at HamsterRepublic.com]

teeemcee
2018-05-14 17:29:50 -0700 (Mon, 14 May 2018)
221
hspeak: delete the partially-written .hs file if an error occurs

Do this because Custom uses existance of the .hs file to check for success.
Custom would attempt to import if various errors occurred while writing the .hs
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U   wip/hspeak.exw
U   wip/hsspiffy.e