Misc cleanup to avoid future confusion.

- Remove more unnecessary debug sections
- Use DBG instead of COPTS to specify -Os as defined in bsd.prog.mk
- Use CFLAGS and CPPFLAGS correctly
- Explicitly set -ffreestanding

Consistently use ${RELEASEDIR}/${RELEASEMACHINE} instead of
${RELEASEDIR}/${MACHINE} (Paul Ripke)

branches: 1.10.10; 1.10.18; 1.10.22;
include bsd.init.mk to get Makefile.inc

branches: 1.9.2;
Avoid "unhandled relocation of type 3 for" error when load module.
"insmod zbsdmod.o" is successful now.

branches: 1.8.4;
Move flags for ARM's APCS ABI into a common variable. Add some forces to
deal with limitations in the Clang <-> LLVM backend interaction to pick
the correct ABI and target assembler.

branches: 1.7.4;
Force abi/float-abi/cpu
Only allow to build on little-endian.
Force MACHINE to be zaurus.

branches: 1.6.6;
- WARNS=4
- object size is more smaller.

branches: 1.5.12; 1.5.16;
Use <bsd.klinks.mk> to create ${MACHINE} and ${MACHINE_ARCH} symlinks.

branches: 1.4.20; 1.4.28; 1.4.34;
Merge the ppcoea-renovation branch to HEAD.

This branch was a major cleanup and rototill of many of the various OEA
cpu based PPC ports that focused on sharing as much code as possible
between the various ports to eliminate near-identical copies of files in
every tree. Additionally there is a new PIC system that unifies the
interface to interrupt code for all different OEA ppc arches. The work
for this branch was done by a variety of people, too long to list here.

TODO:
bebox still needs work to complete the transition to -renovation.
ofppc still needs a bunch of work, which I will be looking at.
ev64260 still needs to be renovated
amigappc was not attempted.

NOTES:
pmppc was removed as an arch, and moved to a evbppc target.

branches: 1.3.2;
Use $INSTALL_FILE, not just $INSTALL so that unpriviliged builds work.

build and install zbsdmod.o.

branches: 1.1.2; 1.1.4; 1.1.6; 1.1.12; 1.1.20; 1.1.24; 1.1.26; 1.1.28;
Update from the latest Zaurus source from NONAKA Kimihiro.

- LCD screen and keyboard are working now.
- Add bootstrap loader.