Tidy up the SWIG guard around LazyRE2.

Change-Id: I03b22b235ab60723ce2f9f8686044e92b931ec27
Reviewed-on: https://code-review.googlesource.com/c/re2/+/51413
Reviewed-by: Paul Wankadia <junyer@google.com>
diff --git a/re2/re2.h b/re2/re2.h
index c39589d..e0a8bbc 100644
--- a/re2/re2.h
+++ b/re2/re2.h
@@ -896,7 +896,6 @@
 #undef MAKE_INTEGER_PARSER
 
 #ifndef SWIG
-
 // Silence warnings about missing initializers for members of LazyRE2.
 // Note that we test for Clang first because it defines __GNUC__ as well.
 #if defined(__clang__)
@@ -949,7 +948,7 @@
 
   void operator=(const LazyRE2&);  // disallowed
 };
-#endif  // SWIG
+#endif
 
 }  // namespace re2