Windows compat fixes.

src/xenia/core/mmap_win.cc

@@ -124,7 +124,7 @@ void xe_mmap_release(xe_mmap_ref mmap) {
 }
 
 uint8_t* xe_mmap_get_addr(xe_mmap_ref mmap) {
-  return mmap->addr;
+  return reinterpret_cast<uint8_t*>(mmap->addr);
 }
 
 size_t xe_mmap_get_length(xe_mmap_ref mmap) {

src/xenia/core/thread.cc

@@ -93,7 +93,7 @@ int xe_thread_start(xe_thread_ref thread) {
       thread,
       0,
       NULL);
-  if (!handle) {
+  if (!thread_handle) {
     uint32_t last_error = GetLastError();
     // TODO(benvanik): translate?
     XELOGE(XT("CreateThread failed with %d"), last_error);