MINIMAL_RUNTIME: Declare wasmExports globally as needed

The conditions under which wasmExports was declared global vs locally
were out of sync.

Also, move the declaration of the global wasmExports alongside the
other wasm globals.

See: #20145

Author: sbc100

src/preamble_minimal.js

@@ -66,6 +66,9 @@ var HEAP8, HEAP16, HEAP32, HEAPU8, HEAPU16, HEAPU32, HEAPF32, HEAPF64,
 #endif
 #if SUPPORT_BIG_ENDIAN
   HEAP_DATA_VIEW,
+#endif
+#if LibraryManager.has('library_exports.js') || EMBIND
+  wasmExports,
 #endif
   wasmMemory, wasmTable;