Fix a build break with SDK 10.14.

* Updated the minimal target version from 10.5 to 10.7.
* Reference for the similar issue:
  RedisInsight/RedisDesktopManager#4284

Fix provided by Hiroyuki Komatsu.

Change-Id: Ie08f8f6084e66d439d8b6282f1f4734b2dfe778f
Reviewed-on: https://chromium-review.googlesource.com/c/breakpad/breakpad/+/1633390
Reviewed-by: Mark Mentovai <mark@chromium.org>

src/client/mac/sender/Breakpad.xib

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <archive type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="7.10">
 	<data>
-		<int key="IBDocument.SystemTarget">1050</int>
+		<int key="IBDocument.SystemTarget">1070</int>
 		<string key="IBDocument.SystemVersion">10F569</string>
 		<string key="IBDocument.InterfaceBuilderVersion">762</string>
 		<string key="IBDocument.AppKitVersion">1038.29</string>
@@ -1114,7 +1114,7 @@ UXVpc3F1ZSBtaS4gRHVpcyBsZWN0dXMuA</string>
 		<string key="IBDocument.TargetRuntimeIdentifier">IBCocoaFramework</string>
 		<object class="NSMutableDictionary" key="IBDocument.PluginDeclaredDependencies">
 			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin.macosx</string>
-			<integer value="1050" key="NS.object.0"/>
+			<integer value="1070" key="NS.object.0"/>
 		</object>
 		<object class="NSMutableDictionary" key="IBDocument.PluginDeclaredDevelopmentDependencies">
 			<string key="NS.key.0">com.apple.InterfaceBuilder.CocoaPlugin.InterfaceBuilder3</string>