[compiler-rt] [compiler-rt] Fix definition of `usize` on 32-bit Windows (PR #106151)

[Martin Storsjö via llvm-commits]

mstorsjo wrote:

> @mstorsjo @zmodem This new minimally invasive version should fix the build breakage - I'll work on cleaning up these typedefs properly in #106155. Please let me know if this fixes the issue.

Thanks, this seems to work for both mingw/i386 and MSVC/i386!

https://github.com/llvm/llvm-project/pull/106151