Update case of basetsd.h import to support cross compilation
diff --git a/gen/src/write.rs b/gen/src/write.rs
index a6f6c3e..862be81 100644
--- a/gen/src/write.rs
+++ b/gen/src/write.rs
@@ -177,7 +177,7 @@
                 needs_rust_slice = true;
             }
             ty if ty == Isize => {
-                out.include.base_tsd = true;
+                out.include.basetsd = true;
                 needs_rust_isize = true;
             }
             ty if ty == RustString => {