Revert "Add safeguards to the ENABLE_SIMD_OPT* definitions missing those"

source/App/BitstreamExtractorApp/bitstreamextractormain.cpp

source/App/DecoderApp/DecAppCfg.cpp

source/App/DecoderApp/decmain.cpp

source/App/EncoderApp/EncAppCfg.cpp

source/App/EncoderApp/encmain.cpp

source/App/SEIFilmGrainApp/SEIFilmGrainMain.cpp

source/App/SEIRemovalApp/seiremovalmain.cpp

source/Lib/CommonLib/Buffer.cpp

source/Lib/CommonLib/Buffer.h

source/Lib/CommonLib/TypeDef.h

source/Lib/DecoderLib/DecLib.cpp

source/Lib/EncoderLib/EncLib.cpp