/usr/bin/winegcc64 is in wine64-tools 1.6.2-20.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 | #!/bin/sh -e
WINEBUILD=/usr/lib/x86_64-linux-gnu/wine/winebuild /usr/lib/x86_64-linux-gnu/wine/winegcc $@
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