GTMAppAuth(GTMAppAuthFetcherAuthorization.o) build failure

[ZOlbrys]

After updating to GTMSessionFetcher 1.6.0 I am seeing the following failure in my build:

Undefined symbols for architecture x86_64:
  "_GTMBridgeAssertValidSelector", referenced from:
      -[GTMAppAuthFetcherAuthorization authorizeRequest:delegate:didFinishSelector:] in GTMAppAuth(GTMAppAuthFetcherAuthorization.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Directed here via google/gtm-session-fetcher#240

[petea]

Fixed with GTMSessionFetcher release 1.6.1:

https://github.com/google/gtm-session-fetcher/releases/tag/v1.6.1