ELF2 main programs pass src/testsuite and upx-testsuite-v2

Decompressing lzma required many adjustments.
Backwards compatibility probably is broken for
    stub/amd64-win64.pe.h
    stub/arm64-win64.pe.h
Also: shared libraries need memfd_create.
	modified:   ../misc/testsuite/upx_testsuite_1-expected_sha256sums.sh
	modified:   p_lx_elf.cpp
	modified:   stub/Makefile
	modified:   stub/scripts/xstrip.py
	modified:   stub/src/amd64-expand.S
	modified:   stub/src/arch/amd64/lzma_d.S
	modified:   stub/src/arch/arm/v4a/lzma_d.S
	modified:   stub/src/arch/arm/v4t/macros.S
	modified:   stub/src/arch/arm64/v8/lzma_d.S
	modified:   stub/src/arch/powerpc/32/lzma_d.S
	modified:   stub/src/arch/powerpc/64le/lzma_d-common.S
	modified:   stub/src/arm.v4a-expand.S
	modified:   stub/src/arm.v4t-linux.shlib-init.S
	modified:   stub/src/arm64-expand.S
	modified:   stub/src/i386-expand.S
	modified:   stub/src/mips.r3000-expand.S
	modified:   stub/src/powerpc-expand.S
	modified:   stub/src/powerpc-linux.elf-entry.S
	modified:   stub/src/powerpc-linux.elf-fold.S
	modified:   stub/src/powerpc64-expand.S
	modified:   stub/src/powerpc64-linux.elf-entry.S
	modified:   stub/src/powerpc64-linux.elf-fold.S
           plus generated *.h *.map *.dump

src/stub/Makefile

@@ -851,6 +851,7 @@ tc.arm64-win64.pe.objcopy  = arm64-linux-objcopy-2.25 -F elf64-littleaarch64
 tc.arm64-win64.pe.objdump  = arm64-linux-objdump-2.25
 
 arm64-win64.pe.h : $(srcdir)/src/$$T.S
+	@echo; echo TARGET=$@  PATH=$(PATH); echo
 	$(call tc,gcc) -c -x assembler-with-cpp $< -o tmp/$T.bin
 	$(call tc,f-embed_objinfo,tmp/$T.bin)
 	$(call tc,bin2h-c) tmp/$T.bin $@