New -DWINDOWS_BACK so that amd64-win64.pe.h does not change.
This hides a real bug (unchecked), but would change anti-virus status.
modified: src/stub/src/amd64-expand.S
modified: src/stub/src/amd64-linux.elf-entry.S
modified: src/stub/src/amd64-linux.elf-fold.S
modified: src/stub/src/arch/amd64/lzma_d.S
modified: src/stub/Makefile
modified: misc/testsuite/upx_testsuite_1-expected_sha256sums.sh
plus generated *.h, *.map, *.dump
John Reiser
c924c32d54