win: Make reading NT_IMAGE_HEADERS work cross-bitness

snapshot/win/crashpad_snapshot_test_image_reader_module.cc

Index: snapshot/win/crashpad_snapshot_test_image_reader_module.cc
diff --git a/snapshot/mac/mach_o_image_annotations_reader_test_no_op.cc b/snapshot/win/crashpad_snapshot_test_image_reader_module.cc
similarity index 84%
copy from snapshot/mac/mach_o_image_annotations_reader_test_no_op.cc
copy to snapshot/win/crashpad_snapshot_test_image_reader_module.cc
index b8953207b4a0d6034622dd753dcb8d97e22a58d6..6e81de9574b63d867e2b53e3c8968f2bd012893b 100644
--- a/snapshot/mac/mach_o_image_annotations_reader_test_no_op.cc
+++ b/snapshot/win/crashpad_snapshot_test_image_reader_module.cc
@@ -12,8 +12,8 @@
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
-#include <stdlib.h>
+#include <windows.h>
 
-int main(int argc, char* argv[]) {
-  return EXIT_SUCCESS;
+BOOL WINAPI DllMain(HINSTANCE hinstance, DWORD reason, LPVOID reserved) {
+  return TRUE;
 }