[embedded] Guard @_transparent in UnsafePointer APIs with #if

Author: kubamracek

stdlib/public/core/UnsafePointer.swift

@@ -370,7 +370,9 @@ public struct UnsafePointer<Pointee>: _Pointer {
   ///            by the key path, or `nil`.
   @inlinable
   @_alwaysEmitIntoClient
+  #if $Embedded
   @_transparent
+  #endif
   public func pointer<Property>(
     to property: KeyPath<Pointee, Property>
   ) -> UnsafePointer<Property>? {
@@ -1132,7 +1134,9 @@ public struct UnsafeMutablePointer<Pointee>: _Pointer {
   ///            by the key path, or `nil`.
   @inlinable
   @_alwaysEmitIntoClient
+  #if $Embedded
   @_transparent
+  #endif
   public func pointer<Property>(
     to property: KeyPath<Pointee, Property>
   ) -> UnsafePointer<Property>? {
@@ -1155,7 +1159,9 @@ public struct UnsafeMutablePointer<Pointee>: _Pointer {
   ///            by the key path, or `nil`.
   @inlinable
   @_alwaysEmitIntoClient
+  #if $Embedded
   @_transparent
+  #endif
   public func pointer<Property>(
     to property: WritableKeyPath<Pointee, Property>
   ) -> UnsafeMutablePointer<Property>? {