[PATCH, libgfortran] Remove AM_MAKEFLAGS PR bootstrap/18895

[David Edelsohn]

	Could you annotate the Makefiles of your native build and your
ia64 cross build to print out the values of $(CC) and $(CC_FOR_TARGET).
For instance in the top-level all-target-libgfortran rule, in the
libgfortran all rule, all-multi rule, and the environ.lo rule for the
multilib that breaks.  That way we can try to trace the value of those
variables in the working native build and the broken cross build.

Thanks, David