Fix SPM analytics warning introduced yesterday (#6504)

FirebaseAnalyticsWrapper/dummy.m

@@ -0,0 +1,17 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Swift Package Manager needs at least one source file.

FirebaseAnalyticsWrapper/include/dummy.h

@@ -0,0 +1,18 @@
+/*
+ * Copyright 2020 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Swift Package Manager needs at least one header to prevent a warning. See
+// https://github.com/firebase/firebase-ios-sdk/pull/6504.

Package.swift

@@ -214,7 +214,6 @@ let package = Package(
         .product(name: "nanopb", package: "nanopb"),
       ],
       path: "FirebaseAnalyticsWrapper",
-      publicHeadersPath: "Public",
       linkerSettings: [
         .linkedLibrary("sqlite3"),
         .linkedLibrary("c++"),

scripts/check_copyright.sh

@@ -24,8 +24,7 @@ options=(
 list=$(git grep "${options[@]}" -- \
     '*.'{c,cc,cmake,h,js,m,mm,py,rb,sh,swift} \
     CMakeLists.txt '**/CMakeLists.txt' \
-    ':(exclude)**/third_party/**' \
-    ':(exclude)FirebaseAnalyticsWrapper/**')
+    ':(exclude)**/third_party/**')
 
 # Allow copyrights before 2020 without LLC.
 result=$(grep -L 'Copyright 20[0-1][0-9].*Google' $list)