Disable check for missing symbols at link time

This causes issues on some Ruby installs, e.g AWS Linux
Keeping it around for diagnostics/future configurable

ext/mini_racer_extension/extconf.rb

@@ -19,8 +19,10 @@ $CPPFLAGS += " -fvisibility=hidden "
 $CPPFLAGS += " -Wno-reserved-user-defined-literal" if IS_DARWIN
 
 $LDFLAGS.insert(0, " -stdlib=libc++ ") if IS_DARWIN
-$LDFLAGS += " -Wl,--no-undefined " unless IS_DARWIN
-$LDFLAGS += " -Wl,-undefined,error " if IS_DARWIN
+
+# check for missing symbols at link time
+# $LDFLAGS += " -Wl,--no-undefined " unless IS_DARWIN
+# $LDFLAGS += " -Wl,-undefined,error " if IS_DARWIN
 
 if ENV['CXX']
   puts "SETTING CXX"