Do not include the man pages in Windows release zip

In v1.0.1 and previous, the released `rgbds-win32.zip` and `rgbds-win64.zip` only contained the executables and DLLs. But in v1.0.2 and v1.0.3, they contain two `bin/` and `share/` directories, with the executables in `bin/` and the man pages in more subdirectories of `share/`.

Windows users have no use for the man pages, and may be confused by them, or may be relying on unzipping the file to immediately get the executables (for example, [hardware.inc's CI testing workflow](https://github.com/gbdev/hardware.inc/blob/2b1da9568b8779622d13c9e46231c05fa3a4d1a0/.github/workflows/testing.yml#L22-L33)). We should consider going back to the simpler binary-only Windows release zips.