also fixes up a few glitches in the jskwgen work and makes make clean zap its generated file
the clean target for js now cleans fdlibm+jskwgen too
the clean target for jsshell now cleans js too
git-svn-id: svn://10.0.0.236/trunk@193513 18797224-902f-48f8-a5cc-f745e15eee43