[libcxx][test] Reverting r327178 and r327190.

Reverting changes made to iter_alloc_deduction.fail.cpp
as my changes seem to be making several Linux bots angry.

llvm-svn: 327191

libcxx/test/std/strings/basic.string/string.cons/iter_alloc_deduction.fail.cpp

@@ -9,7 +9,8 @@
 
 // <string>
 // UNSUPPORTED: c++98, c++03, c++11, c++14
-// UNSUPPORTED: libcpp-no-deduction-guides
+// UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8, clang-3.9, clang-4.0
+// UNSUPPORTED: apple-clang-6, apple-clang-7, apple-clang-8.0
 
 // template<class InputIterator,
 //      class Allocator = allocator<typename iterator_traits<InputIterator>::value_type>>