a cpu option of the configure script as a method to specify a target cpu
a cpu option of the configure script as a method to specify a target cpu

    * don't setup a cpu before scanning for --cpu=
    * --cpu= option sets a 'cpu' variable, not a 'build_cpu', 'build_cpu' was not used anywhere.
    * if cpu="" and ARCH != "" then cpu=$ARCH else cpu=`uname -m`
    * replace "Build CPU" with "Target CPU" in the output of the configure script.
      output this value only when not builing a cross compilers.
    * remove a HOST_I386, ... defines from a config.h file.
      thise defines are not used anywhere and cpu is now used to define a target cpu

mingodad/tinycc,code4game/tinycc,fstudio/tinycc,avih/tinycc,andrewchambers/tccmirror,seyko2/tinycc,run4flat/tinycc,run4flat/tinycc,metaeducation/tcc,seyko2/tinycc,andreiw/tinycc,metaeducation/tcc,fstudio/tinycc,mirror/tinycc,run4flat/tinycc,mirror/tinycc,fstudio/tinycc,fstudio/tinycc,andrewchambers/tccmirror,metaeducation/tcc,andrewchambers/tccmirror,code4game/tinycc,avih/tinycc,andreiw/tinycc,mingodad/tinycc,code4game/tinycc,seyko2/tinycc,seyko2/tinycc,seyko2/tinycc,fstudio/tinycc,metaeducation/tcc,metaeducation/tcc,mirror/tinycc,mingodad/tinycc,run4flat/tinycc,avih/tinycc,mirror/tinycc,andrewchambers/tccmirror,avih/tinycc,mingodad/tinycc,andrewchambers/tccmirror,andreiw/tinycc,run4flat/tinycc