Setting of CPU type in *features* not portable to different platforms

[dg1sbg]

1. Function void Lisp_O::parseCommandLineArguments() in file lisp.cc contains a number of features setup commands that are not depending on cmd line args.
2. Some of these features are platform dependent - e.g. CPU type. For a correct setting of CPU types see: http://nadeausoftware.com/articles/2012/02/c_c_tip_how_detect_processor_type_using_compiler_predefined_macros#Howtodetecttheprocessortype

Possible solution approach: Factor out setting features not depending on cmd line args into a separate function. Then use the article's recommendations to set-up the CPU type in features.