1) Disabled abi_check rule for all compilers except gcc
2) restored the -dI option to retain the header information.

Makefile.am:
  1) changed all-local to depend on a configure variable
     that will be set based on if the compiler is gcc.
  2) restored the -dI option removed earlier since now
     only gcc is being used.
configure.in:
  Added a check to see if gcc is being used. If it is being
  used set the ABI_CHECK variable to the abi_check target.
include/mysql.h.pp:
  The .pp file is changed to correspond to the option
  -dI.