[OSLog] Add missing imports for implicit uses of NSObject

Author: xymus

stdlib/private/OSLog/OSLogFloatingPointTypes.swift

@@ -20,6 +20,8 @@
 //
 //    "\(x, format: .fixed(precision: 10), privacy: .private\)"
 
+import ObjectiveC
+
 extension OSLogInterpolation {
 
   /// Defines interpolation for expressions of type Float.

stdlib/private/OSLog/OSLogIntegerTypes.swift

@@ -22,6 +22,8 @@
 //  1.  "\(x, format: .hex, privacy: .private, align: .right\)"
 //  2.  "\(x, format: .hex(minDigits: 10), align: .right(columns: 10)\)"
 
+import ObjectiveC
+
 extension OSLogInterpolation {
 
   /// Defines interpolation for expressions of type Int.

stdlib/private/OSLog/OSLogStringTypes.swift

@@ -22,6 +22,8 @@
 //  1.  "\(x, privacy: .private, align: .right\)"
 //  2.  "\(x, align: .right(columns: 10)\)"
 
+import ObjectiveC
+
 extension OSLogInterpolation {
 
   /// Defines interpolation for expressions of type String.