Move getNativeTypeSize library function as legacy. NFC

This function is not used anywhere in emscripten anymore.

Author: sbc100

src/lib/libcore.js

@@ -2267,9 +2267,6 @@ addToLibrary({
     }
   },
 
-  $getNativeTypeSize__deps: ['$POINTER_SIZE'],
-  $getNativeTypeSize: {{{ getNativeTypeSize }}},
-
   $wasmTable__docs: '/** @type {WebAssembly.Table} */',
 #if RELOCATABLE
   // In RELOCATABLE mode we create the table in JS.

src/lib/liblegacy.js

@@ -122,6 +122,9 @@ legacyFuncs = {
   // (This was a mistake in the original implementation, and kept
   // to avoid breakage.)
   $jstoi_s: 'Number',
+
+  $getNativeTypeSize__deps: ['$POINTER_SIZE'],
+  $getNativeTypeSize: {{{ getNativeTypeSize }}},
 };
 
 if (WARN_DEPRECATED && !INCLUDE_FULL_LIBRARY) {