Add Helium 7 support for package builds. - During operation, if last.major.helium.version is detected as 7.0 then it will use new sbsinput mechanism. - Restore sf-postbuild dependency on sf-build-noprep target

@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