Cleanup after Thierry Fauck changes for ppc64le.

We need a "UPX standard" compiler in order to re-compile the stubs for ppc64le;
meanwhile use Thierry's "pre-compiled" stubs.
Revert powerpc stubs to those produced by UPX standard powerpc.405-linux-gcc-3.4.5.
Cleanup the workarounds that Thierry used because he lacked upx-stubtools 20130920.
ARMv8 (64-bit) compiles but is incomplete and does not run yet.

 changed src/Makefile
 changed src/linker.cpp
 changed src/stub/Makefile
 changed src/stub/amd64-linux.elf-entry.h
 changed src/stub/arm64-darwin.macho-entry.h
 changed src/stub/arm64-darwin.macho-fold.h
 changed src/stub/powerpc-darwin.dylib-entry.h
 changed src/stub/powerpc-darwin.macho-entry.h
 changed src/stub/powerpc-darwin.macho-fold.h
 changed src/stub/powerpc-linux.elf-entry.h
 changed src/stub/powerpc-linux.elf-fold.h
 changed src/stub/powerpc-linux.kernel.vmlinux.h
 changed src/stub/scripts/xstrip.py
 changed src/stub/src/arch/arm/v8a/lzma_d.S
 changed src/stub/src/arch/arm/v8a/macros.S
 changed src/stub/src/arm64-darwin.macho-entry.S
 changed src/stub/tmp/arm64-darwin.macho-entry.bin.dump

src/Makefile

@@ -10,7 +10,6 @@
 # dependencies on the default values of builtin variables,
 # then we cannot use builtin variables at all.
 MAKEFLAGS += -rR
-DEBUG=1
 
 .SUFFIXES:
 export SHELL = /bin/sh