Luau MSVC target is compiled without exceptions

[trumank]

This seems to be just a warning compiling on windows via MSVC:

[mlua-sys 0.8.3] C:\Users\truman\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\luau0-src-0.15.9+luau694\luau\Ast\src\Parser.cpp(219): warning C4530: C++ exception handler used, but unwind semantics are not enabled. Specify /EHsc

But when cross compiling to x86_64-pc-windows-msvc via xwin (using clang-cl) it become an error:

cargo xwin build --release --target x86_64-pc-windows-msvc --features=luau

...

error: failed to run custom build command for `mlua-sys v0.8.3 (mlua/mlua-sys)`

Caused by:
  process didn't exit successfully: `mlua/target/release/build/mlua-sys-a4b95a46e60ed4ca/build-script-main` (exit status: 1)
  --- stdout
  cargo:rerun-if-changed=build
  cargo:warning=luau-src-rs/luau/Ast/src/Parser.cpp(123,5): error: cannot use 'throw' with exceptions disabled
  cargo:warning=  123 |     throw ParseError(location, message);
  cargo:warning=      |     ^
  cargo:warning=luau-src-rs/luau/Ast/src/Parser.cpp(219,5): error: cannot use 'try' with exceptions disabled
  cargo:warning=  219 |     try
  cargo:warning=      |     ^
  cargo:warning=luau-src-rs/luau/Ast/src/Parser.cpp(241,5): error: cannot use 'try' with exceptions disabled
  cargo:warning=  241 |     try
  cargo:warning=      |     ^
  cargo:warning=luau-src-rs/luau/Ast/src/Parser.cpp(4361,9): error: cannot use 'throw' with exceptions disabled
  cargo:warning= 4361 |         throw ParseError(location, message);
  cargo:warning=      |         ^
  cargo:warning=4 errors generated.

I do not know if keeping exceptions disabled is intended, but adding the following to src/lib.rs allows compiling via xwin:

if target.ends_with("msvc") {
    config.flag_if_supported("/EHsc");
}