Fix SUPPORT_BIG_ENDIAN settings (#21752)

Fixes: #21751

Author: sbc100

src/runtime_shared.js

@@ -31,7 +31,7 @@
 function updateMemoryViews() {
   var b = wasmMemory.buffer;
 #if SUPPORT_BIG_ENDIAN
-  {{{ maybeExport('HEAP_DATA_VIEW') }}} HEAP_DATA_VIEW = new DataView(b);
+  {{{ maybeExportHeap('HEAP_DATA_VIEW') }}} HEAP_DATA_VIEW = new DataView(b);
 #endif
   {{{ maybeExportHeap('HEAP8')   }}}HEAP8 = new Int8Array(b);
   {{{ maybeExportHeap('HEAP16')  }}}HEAP16 = new Int16Array(b);

test/test_other.py

@@ -14680,3 +14680,7 @@ def test_mimalloc_headers(self):
       }
     '''
     self.do_run(src, emcc_args=['-sMALLOC=mimalloc'])
+
+  def test_SUPPORT_BIG_ENDIAN(self):
+    # Just a simple build-only test for now
+    self.run_process([EMCC, '-sSUPPORT_BIG_ENDIAN', test_file('hello_world.c')])