1) Introducing support for 32/64-bit variants of the patch files 2) Fix bug in fix_epoc32_linux.pl whereby changes to the gcc -preinclude patch file were not applied if already existed. 3) Extending weed_backups.pl to weed the epoc32 tree as well as the package dir 4) Make build_target.pl return non-0 if build has warnings 5) Make build_all.pl fail a target if it has warnings

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