Allow _Unwind_RaiseException with MinGW

Author: bjorn3

src/tools/miri/src/shims/unix/foreign_items.rs

@@ -649,7 +649,9 @@ pub trait EvalContextExt<'tcx>: crate::MiriInterpCxExt<'tcx> {
                 // For arm32 they did something custom, but similar enough that the same
                 // `_Unwind_RaiseException` impl in miri should work:
                 // https://github.com/ARM-software/abi-aa/blob/main/ehabi32/ehabi32.rst
-                if !matches!(&*this.tcx.sess.target.os, "linux" | "freebsd" | "illumos" | "solaris" | "android" | "macos") {
+                // MinGW implements _Unwind_RaiseException on top of SEH exceptions.
+                if !matches!(&*this.tcx.sess.target.os, "linux" | "freebsd" | "illumos" | "solaris" | "android" | "macos")
+                    && !(this.tcx.sess.target.os == "windows" && this.tcx.sess.target.env == "gnu") {
                     throw_unsup_format!(
                         "`_Unwind_RaiseException` is not supported on {}",
                         this.tcx.sess.target.os