- Reworked testing for gcc3 in the RPM spec file a bit


Build-tools/Do-rpm:
  Big overhaul:
  
   - Give the spec file name as the option, not the version number (required
     to be able to build commercial RPMs, too)
   - Some more logging and debugging, more documentation
support-files/mysql.spec.sh:
   - made testing for gcc3 a bit more robust and not to stomp on user
     settings for CXX