Fix CocoaPods integration without DevSupport subspec

Summary:
This is the thing which is handled in https://github.com/orta/cocoapods-fix-react-native today.

89a78ad349/lib/cocoapods-fix-react-native/versions/0_55_3-post.rb (L140-L164)

This should be the correct fix for #17799.

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Integrating React Native into an existing iOS project using CocoaPods without `DevSupport` subspec and seeing if the project successfully compiles.

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[IOS] [BUGFIX] [DevSupport] - Fix CocoaPods integration without DevSupport subspec
Closes https://github.com/facebook/react-native/pull/19265

Differential Revision: D8149786

Pulled By: hramos

fbshipit-source-id: c665e463b76aacdfb2022e82e36eb381d2d9ff2b

React/Modules/RCTDevSettings.mm

@@ -18,7 +18,6 @@
 #import "RCTEventDispatcher.h"
 #import "RCTJSCSamplingProfiler.h"
 #import "RCTLog.h"
-#import "RCTPackagerClient.h"
 #import "RCTProfile.h"
 #import "RCTUtils.h"
 
@@ -35,6 +34,7 @@ static NSString *const kRCTDevSettingStartSamplingProfilerOnLaunch = @"startSamp
 static NSString *const kRCTDevSettingsUserDefaultsKey = @"RCTDevMenu";
 
 #if ENABLE_PACKAGER_CONNECTION
+#import "RCTPackagerClient.h"
 #import "RCTPackagerConnection.h"
 #endif
 
@@ -201,6 +201,7 @@ RCT_EXPORT_MODULE()
 #endif
 }
 
+#if ENABLE_PACKAGER_CONNECTION
 static void pokeSamplingProfiler(RCTBridge *const bridge, RCTPackagerClientResponder *const responder)
 {
   if (!bridge) {
@@ -224,6 +225,7 @@ static void pokeSamplingProfiler(RCTBridge *const bridge, RCTPackagerClientRespo
     [responder respondWithResult:results];
   }
 }
+#endif
 
 - (dispatch_queue_t)methodQueue
 {