Added CPU automatic detection. It examines /proc/cpuinfo (if exists) and finds out flags for -mcpu and -march.
TODO is --with-cpu configure option to force some other processor type.
Problem is not big as any Intel 686+ CPU will use -mcpu=pentiumpro anyway. Exceptions are Athlons and 586 processors.


BUILD/SETUP.sh:
  Removed hardcoded processor type as it will be added later by configure
acinclude.m4:
  Added CPU automatic detection
configure.in:
  Added CPU automatic detection