Comment out Bridged tests that cannot run on Linux

Author: tbkka

test/stdlib/ParseFloat64.swift

@@ -9,7 +9,6 @@
 // REQUIRES: swift_feature_Extern
 
 import StdlibUnittest
-import Foundation
 
 let tests = TestSuite("FloatingPointParsing")
 
@@ -326,14 +325,24 @@ tests.test("Decimal Floats") {
   expectParse("999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999.999999999999999999999999999", Float64.infinity)
 }
 
-tests.test("Substring") {
+tests.test("Substring - short") {
   let s1 = "1.02.03.0"
   let s1sub = s1[s1.firstIndex(of: "2")!..<s1.firstIndex(of: "3")!]
   let parsed = Float64(s1sub)
   expectNotNil(parsed)
   expectEqual(parsed!.bitPattern, (2.0).bitPattern)
 }
 
+tests.test("Substring - long") {
+  let s1 = "1.00000000000000000000000000000000002.0000000000000000000000000000000000000000000000000000000003.00000000000000004.0000000000000000"
+  let s1sub = s1[s1.firstIndex(of: "2")!..<s1.firstIndex(of: "3")!]
+  let parsed = Float64(s1sub)
+  expectNotNil(parsed)
+  expectEqual(parsed!.bitPattern, (2.0).bitPattern)
+}
+
+/*
+ // These need Foundation to run, so can't run on Linux?
 tests.test("Bridged - short") {
   let s1 = "1.02.03.0"
   let nss1 = NSString(utf8String: s1)!
@@ -355,6 +364,7 @@ tests.test("Bridged - long") {
   expectNotNil(parsed)
   expectEqual(parsed!.bitPattern, (2.0).bitPattern)
 }
+ */
 
 @_extern(c, "_swift_stdlib_strtod_clocale")
 func _swift_stdlib_strtod_clocale(