[test] Temporarily disable String.completePath() test.

Author: Greg Parker

test/stdlib/NSStringAPI.swift

@@ -363,8 +363,12 @@ NSStringAPIs.test("compare(_:options:range:locale:)") {
       "абв".compare("абв", locale: Locale.current))
 }
 
-NSStringAPIs.test("completePath(into:caseSensitive:matchesInto:filterTypes)") {
+NSStringAPIs.test("completePath(into:caseSensitive:matchesInto:filterTypes)")
+  // FIXME: temporarily disabled due to OS problems
+  .skip(.always("rdar://29593261"))
+  .code {
   let (existingPath, nonExistentPath) = createNSStringTemporaryFile()
+
   do {
     var count = nonExistentPath.completePath(caseSensitive: false)
     expectEqual(0, count)