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This commit adds support for building the 64-bit version of NSIS, and also bumps the version to 3.03. Doing this enables us to build MAR files in a 64-bit container for the 64-bit version of Tor Browser; see bug 26363 and bug 24477. The pe_checksum_fix.py doesn't work in a 64-bit container with the bundled python-pefile version so we build its latest version to fix this issue. This change is borrowed from commit bb32ec91 and updates python-pefile to 2017.11.5. The Debian package and the patches are no longer required as all changes were merged upstream in 3.01-1. (See the nsis changelog in Debian.)