Modified sf-check-missing-os-files to deal with 'sf.os.compile.iterate' property. Added new target 'sf-compile-options' for setting the gmake sbs compile option, and added it as a dep for the compile targets.

@echo off
setlocal
if not defined HELIUM_HOME set HELIUM_HOME=%~dp0..\..\..\..\helium
echo %HELIUM_HOME%
rem call ..\..\build\env.bat
call %HELIUM_HOME%\hlm.bat %*
endlocal