treat carriage returns as whitespace when parsing types.def

On Windows, some versions of Git automatically translate Unix line
endings to Windows line endings, which can break the build unless we
treat carriage returns as whitespace when parsing.

src/type-generator.cpp

@@ -790,7 +790,7 @@ read(Input* in, Object* eos, int level)
       }
     } break;
 
-    case ' ': case '\t': case '\n': {
+    case ' ': case '\t': case '\n': case '\r': {
       if (s.first) {
         return String::make(s.first);
       }