MS-DOS Date and MS-DOS Time are packed 16-bit values
(https://learn.microsoft.com/en-us/windows/win32/sysinfo/ms-dos-date-and-time)
and when combined they make a 32-bit value.
In the original minizip that comes with zlib, the combined dosDate
parameter is a uLong, which is 64 bits on LP64 platforms. In minizip-ng,
it is a uint32_t.
At one point, minizip-ng renamed the dosDate struct member of
zip_fileinfo to dos_date, but more recent versions changed it back
to dosDate for compatibility, except the size remains different,
so our compatibility check can't distinguish the size.
clang (and possibly other compilers) complain about shortening a 64 bit
unsigned long to a uint32_t so make the return value from our
qDateToDosDate a uint32_t as it should be to avoid warnings on
distributions with minizip-ng
Also the maximum year value that can be stored in the format is
127, since it occupies bits 9-15 of the MS-DOS Date. (There was
probably some confusion since the maximum year is 2107, but its
offset from 1980, not 1900.)
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