enable DEP (NX bit) for 32-bit Windows executables

This is already enabled by default for x86_64 executables on Windows,
but it needs to be manually enabled on x86.

Closes #16533
auto merge of #16534 : thestinger/rust/dep, r=huonw

This is already enabled by default for x86_64 executables on Windows,
but it needs to be manually enabled on x86.

Closes #16533