Remove unused ntdef.h include

[wingertge]

Description

ntdef.h wasn't actually used and caused a compiler error on at least one machine. This removes the unnecessary include. Keep in mind for later in case winver.h also causes issues, in which case we'd need to copy paste the relevant definitions from that into the .rc file here.

Tests

Make sure you've run and fixed any issues with these commands:

• cargo fmt --all -- --check to check standard code formatting (cargo fmt --all applies these changes)
• cargo clippy --all --all-features -- -D warnings -D clippy::unwrap_used -A clippy::needless_collect to check that you're using the standard code style
• cargo build; cargo test --all --all-features to check that all the tests pass

[fdncred]

nice catch! thanks!