Remove old build system.

Make-common.gmake

build/Make-append

build/Make-template

build/platforms/Make-setup

build/platforms/Makefile

build/platforms/aix-cc/Make-platform

build/platforms/aix-gcc/Make-platform

build/platforms/freebsd2-gcc/Make-platform

build/platforms/freebsd3-gcc/Make-platform

build/platforms/hpux-c89/Make-platform

build/platforms/hpux-cc/Make-platform

build/platforms/hpux-gcc/Make-platform

build/platforms/irix-cc/Make-platform

build/platforms/irix-gcc/Make-platform

build/platforms/linux-gcc/Make-platform

build/platforms/ncr-mp-ras-2-cc/Make-platform

build/platforms/netbsd-cc/Make-platform

build/platforms/netbsd-gcc/Make-platform

build/platforms/nextstep-cc/Make-platform

build/platforms/osf1-cc/Make-platform