Patch Wasm headers to fix MinGW build

utils.py

@@ -49,5 +49,7 @@ def download_wasmer(env, force=False, version=VERSION_DEFAULT):
     elif env["platform"] == "windows":
         if env.get("use_mingw"):
             download_tarfile(BASE_URL.format(version, "windows-gnu64"), "wasmer")
+            # Temporary workaround for https://github.com/ashtonmeuser/godot-wasm/issues/26
+            os.system("patch -p1 < wasm-mingw.patch")
         else:
             download_tarfile(BASE_URL.format(version, "windows-amd64"), "wasmer")

wasm-mingw.patch

@@ -0,0 +1,26 @@
+diff --git a/wasmer/include/wasm.h b/wasmer/include/wasm.h
+index 0873193..54cee8f 100644
+--- a/wasmer/include/wasm.h
++++ b/wasmer/include/wasm.h
+@@ -10,7 +10,7 @@
+ #include <assert.h>
+
+ #ifndef WASM_API_EXTERN
+-#ifdef _WIN32
++#if defined(_WIN32) && !defined(__MINGW32__)
+ #define WASM_API_EXTERN __declspec(dllimport)
+ #else
+ #define WASM_API_EXTERN
+diff --git a/wasmer/include/wasm.hh b/wasmer/include/wasm.hh
+index f0b3ee2..a344e24 100644
+--- a/wasmer/include/wasm.hh
++++ b/wasmer/include/wasm.hh
+@@ -12,7 +12,7 @@
+ #include <string>
+
+ #ifndef WASM_API_EXTERN
+-#ifdef _WIN32
++#if defined(_WIN32) && !defined(__MINGW32__)
+ #define WASM_API_EXTERN __declspec(dllimport)
+ #else
+ #define WASM_API_EXTERN