[iOS] Ensure $(inherited) flag is present in Xcode project build settings

[dpa99c]

Currently an iOS build outputs this warning:

[!] The `FirebaseTest [Debug]` target overrides the `LD_RUNPATH_SEARCH_PATHS` build setting defined in `Pods/Target Support Files/Pods-FirebaseTest/Pods-FirebaseTest.debug.xcconfig'. This can lead to problems with the CocoaPods installation

[!] The `FirebaseTest [Release]` target overrides the `LD_RUNPATH_SEARCH_PATHS` build setting defined in `Pods/Target Support Files/Pods-FirebaseTest/Pods-FirebaseTest.release.xcconfig'. This can lead to problems with the CocoaPods installation

    - Use the `$(inherited)` flag, or
    - Remove the build settings from the target.
    - Use the `$(inherited)` flag, or
    - Remove the build settings from the target.

This can lead to iOS build issues (see #22).

So the plugin hook scripts need to ensure the $(inherited) flag is present in the LD_RUNPATH_SEARCH_PATHS field of the Xcode project build settings.

[dpa99c]

Fix published in cordova-plugin-firebasex@3.0.7

[sebastian-zarzycki-apzumi]

FWIW I still see these warnings in 3.0.7.

[dpa99c]

you will see the warnings on cordova platform add ios because that's before the after_prepare script has run.
But if you run cordova prepare ios or cordova build ios you won't see them, which is what matters.

[sebastian-zarzycki-apzumi]

Ah. It's ok then, I guess. Thanks.

[consciousimages]

I actually see the warning in both places - cordova platform add ios as well as cordova build ios, using version 6.0.2.