Restore libcxx skips

microsoft#5015 unskipped these, they now go through the same old codepath.

tests/libcxx/expected_results.txt

@@ -24,6 +24,10 @@ std/time/time.syn/formatter.year_month_weekday.pass.cpp:1 FAIL
 std/time/time.syn/formatter.zoned_time.pass.cpp:0 FAIL
 std/time/time.syn/formatter.zoned_time.pass.cpp:1 FAIL
 
+# LLVM-74756: [libc++][test] overload_compare_iterator doesn't support its claimed iterator_category
+std/utilities/memory/specialized.algorithms/uninitialized.copy/uninitialized_copy.pass.cpp FAIL
+std/utilities/memory/specialized.algorithms/uninitialized.move/uninitialized_move.pass.cpp FAIL
+
 # LLVM-90196: [libc++][format] Formatting range with m range-type is incorrect
 std/utilities/format/format.range/format.range.formatter/format.functions.format.pass.cpp FAIL
 std/utilities/format/format.range/format.range.formatter/format.functions.vformat.pass.cpp FAIL