implementing the content of PR

rnmapbox#3937

In order to be able to run the example app that uses react-native 0.81.0

Author: whiteHatCip

ios/RNMBX/RNMBXModelsComponentView.mm

@@ -12,8 +12,8 @@
 
 #import "rnmapbox_maps-Swift.pre.h"
 
-#import "RCTFollyConvert.h"
 #import "RNMBXFabricPropConvert.h"
+#import "FollyImporter.h"
 
 
 // TODO: use generated RNMBXModelsEventEmitter, but need 0.73+ for dynamic support

ios/RNMBX/RNMBXViewportComponentView.mm

@@ -12,7 +12,7 @@
 
 #import "rnmapbox_maps-Swift.pre.h"
 
-#import "RCTFollyConvert.h"
+#import "FollyImporter.h"
 
 
 // TODO: use generated RNMBXViewportEventEmitter, but need 0.73+ for dynamic support

ios/RNMBX/Utils/FollyImporter.h

@@ -0,0 +1,15 @@
+#ifdef RCT_NEW_ARCH_ENABLED
+
+#if __has_include(<react/utils/FollyConvert.h>)
+  // static libs / header maps (no use_frameworks!)
+  #import <react/utils/FollyConvert.h>
+#elif __has_include("FollyConvert.h")
+  /// `use_frameworks! :linkage => :static` users will need to import FollyConvert this way
+  #import "FollyConvert.h"
+#elif __has_include("RCTFollyConvert.h")
+  #import "RCTFollyConvert.h"
+#else
+  #error "FollyConvert.h not found. Ensure React-utils & RCT-Folly pods are installed."
+#endif
+
+#endif