Error messages (on x86_64):

  {standard input}: Assembler messages:
  {standard input}:28: Error: `(%esp)' is not a valid 64 bit base/index expression
  {standard input}:31: Error: `(%esp)' is not a valid 64 bit base/index expression
  {standard input}:34: Error: `(%esp)' is not a valid 64 bit base/index expression
  gmake[8]: *** [cpu_detect_x86_gcc.lo] Error 1

This part of the CPU detection code is now skipped on x86_64.
Signed-off-by: Stefan Knoblich <stkn@openisdn.net>