fix macOS build

Swift/DatabaseConfiguration.swift

@@ -38,7 +38,8 @@ public struct DatabaseConfiguration {
     /// is very safe but it is also dramatically slower.
     public var fullSync: Bool = defaultFullSync
 
-    #if !TARGET_OS_OSX
+
+    #if !os(macOS)
     /// Enables or disables memory-mapped I/O. By default, memory-mapped I/O is enabled.
     /// Disabling it may affect database performance. Typically, there is no need to modify this setting.
     /// - Note: Memory-mapped I/O is always disabled to prevent database corruption on macOS.
@@ -61,7 +62,11 @@ public struct DatabaseConfiguration {
         if let c = config {
             self.directory = c.directory
             self.fullSync = c.fullSync
+
+            #if !os(macOS)
             self.mmapEnabled = c.mmapEnabled
+            #endif
+
             #if COUCHBASE_ENTERPRISE
             self.encryptionKey = c.encryptionKey
             #endif
@@ -74,7 +79,11 @@ public struct DatabaseConfiguration {
         let config = CBLDatabaseConfiguration()
         config.directory = self.directory
         config.fullSync = self.fullSync
+
+        #if !os(macOS)
         config.mmapEnabled = self.mmapEnabled
+        #endif
+
         #if COUCHBASE_ENTERPRISE
         config.encryptionKey = self.encryptionKey?.impl
         #endif