fix: fix path to external libraries in podspec (#600)

Author: vltkv

apps/fabric-example/ios/Podfile.lock

@@ -2961,7 +2961,7 @@ SPEC CHECKSUMS:
   ReactAppDependencyProvider: 3267432b637c9b38e86961b287f784ee1b08dde0
   ReactCodegen: d82f538f70f00484d418803f74b5a0ea09cc8689
   ReactCommon: b028d09a66e60ebd83ca59d8cc9a1216360db147
-  RNAudioAPI: 7ba48681da626677a851e7b91d7910b776410976
+  RNAudioAPI: a2e1467619b270f2b7c922528e624063b13c77c6
   RNGestureHandler: eeb622199ef1fb3a076243131095df1c797072f0
   RNReanimated: 402e6a3b84071df4da6264630a1b99962a113d2d
   RNScreens: ee2abe7e0c548eed14e92742e81ed991165c56aa

packages/react-native-audio-api/RNAudioAPI.podspec

@@ -35,9 +35,8 @@ Pod::Spec.new do |s|
 
   s.compiler_flags = "#{folly_flags}"
 
-external_dir = "$(PODS_TARGET_SRCROOT)/common/cpp/audioapi/external"
-# lib_dir = "$(PODS_TARGET_SRCROOT)/common/cpp/audioapi/external/$(PLATFORM_NAME)"
-lib_dir = "$(SRCROOT)/../../../packages/react-native-audio-api/common/cpp/audioapi/external/$(PLATFORM_NAME)"
+external_dir = File.join(__dir__, "common/cpp/audioapi/external")
+lib_dir = "#{external_dir}/$(PLATFORM_NAME)"
 
 
 s.pod_target_xcconfig = {