Use cocoapods default prefix header

The current search logic didn't write the default prefix header which is
required for some cocoapods. It follows the logic defined in
lib/cocoapods/installer/xcode/pods_project_generator/pod_target_installer.rb:170

Additonally, this was discovered when updating to react native and there
was a required fix for bazel here, which we won't need to keep up with
facebook/react-native#28946

BazelExtensions/extensions.bzl

@@ -83,35 +83,6 @@ def acknowledged_target(name,
  visibility=["//visibility:public"]
  )
 
-# pch_with_name_hint
-#
-# Take in a name hint and return the PCH with that name
-#
-# Parameters
-#
-# hint - Suggestion of pch file name. If any part of this is in a PCH
-# filename it will match
-#
-# sources - a list of source file patterns with pch extensions to search
-
-
-def pch_with_name_hint(hint, sources):
- # Recursive glob the sources directories and the root directory
- candidates = native.glob(["*.pch", hint + "/*.pch"] + sources)
- if len(candidates) == 0:
- return None
-
- # We want to get the candidates in order of lowest to highest
- for candidate in candidates:
- if hint in candidate:
- return candidate
- # It is a convention in iOS/OSX development to use a PCH
- # with the name of the target.
- # This is a hack because, the recursive glob may find some
- # arbitrary PCH.
- return None
-
-
 def _make_module_map(pod_name, module_name, deps, is_system):
  # Up some dirs to the compilation root
  # bazel-out/ios_x86_64-fastbuild/genfiles/external/__Pod__

Examples/React/Podfile

@@ -12,5 +12,6 @@ end
 
 target 'ios-app' do
  rn_pods()
+ pod "SocketRocket"
 end