fix: properly expose precompile flags for Ti.Media.queryMusicLibrary API

[hansemannn]

Fixes #13396

[m1ga]

will show this error

[TRACE] In file included from /Users/miga/Documents/titanium/test_test/build/iphone/Classes/MediaModule.m:11:
[TRACE] /Users/miga/Documents/titanium/test_test/build/iphone/Classes/MediaModule.h:56:3: error: unknown type name 'MPMediaPickerController'; did you mean 'UIImagePickerController'?
[TRACE]   MPMediaPickerController *musicPicker;
[TRACE]   ^~~~~~~~~~~~~~~~~~~~~~~
[TRACE]   UIImagePickerController
[TRACE] In module 'UIKit' imported from /Users/miga/Documents/titanium/test_test/build/iphone/test_test_Prefix.pch:7:
[TRACE] /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS15.4.sdk/System/Library/Frameworks/UIKit.framework/Headers/UIImagePickerController.h:69:12: note: 'UIImagePickerController' declared here
[TRACE] @interface UIImagePickerController : UINavigationController <NSCoding>
[TRACE]            ^
[TRACE] 1 error generated.

[hansemannn]

Sorry, missed one import check! Pre-compile statements are super stressful, but they are an important feature to prevent app rejections (because things like camera API's require the NSCameraUsageDescription). I hope it's fine now!

[m1ga]

Builds fine now. I'll close mine in favor of this one