add ignored files

spec/fixtures/packages/package-with-both-incompatible-and-compatible-native-modules/node_modules/compatible-native-module/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "compatible-native-module",
+  "main": "./main.js"
+}

spec/fixtures/packages/package-with-both-incompatible-and-compatible-native-modules/node_modules/native-module/main.js

@@ -0,0 +1 @@
+throw new Error("this simulates a native module's failure to load")

spec/fixtures/packages/package-with-both-incompatible-and-compatible-native-modules/node_modules/native-module/package.json

@@ -0,0 +1,4 @@
+{
+  "name": "native-module",
+  "main": "./main.js"
+}