Build Error when building for Standalone (InMobi and Pangle)

[jbattersby-gg]

The following errors occur when trying to build for Standalone:
Library\PackageCache\com.google.ads.mobile.mediation.inmobi@4.6.5\source\plugin\Assets\GoogleMobileAds\Mediation\InMobi\Api\InMobi.cs(24,57): error CS0103: The name 'InMobiClientFactory' does not exist in the current context
Library\PackageCache\com.google.ads.mobile.mediation.pangle@4.3.1\source\plugin\Assets\GoogleMobileAds\Mediation\Pangle\Api\Pangle.cs(35,20): error CS0103: The name 'PangleClientFactory' does not exist in the current context

[jbattersby-gg]

Suggested fix: #97