SR-5591: Date formatter now works on Linux

Author: spevans

TestFoundation/TestDateFormatter.swift

@@ -191,7 +191,6 @@ class TestDateFormatter: XCTestCase {
     // en_US   EEEE, MMMM d, y 'at' h:mm:ss a zzzz  Friday, December 25, 2015 at 12:00:00 AM Greenwich Mean Time
     func test_dateStyleFull() {
 
-#if os(macOS) // timestyle .full is currently broken on Linux, the timezone should be 'Greenwich Mean Time' not 'GMT'
         let timestamps: [TimeInterval:String] = [
             // Negative time offsets are still buggy on macOS
             -31536000 : "Wednesday, January 1, 1969 at 12:00:00 AM GMT", 0.0 : "Thursday, January 1, 1970 at 12:00:00 AM Greenwich Mean Time",
@@ -218,7 +217,6 @@ class TestDateFormatter: XCTestCase {
 
             XCTAssertEqual(sf, stringResult)
         }
-#endif
     }
 
     // Custom Style