[libFuzzer] Disable afl tests on non-posix systems.

AflDriver is not supported on non posix systems.

Differential Revision: https://reviews.llvm.org/D29422

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@293830 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Fuzzer/test/afl-driver-extra-stats.test

@@ -1,3 +1,5 @@
+REQUIRES: posix
+
 ; Test that not specifying an extra stats file isn't broken.
 RUN: unset AFL_DRIVER_EXTRA_STATS_FILENAME
 RUN: AFLDriverTest

lib/Fuzzer/test/afl-driver-stderr.test

@@ -1,3 +1,5 @@
+REQUIRES: posix
+
 ; Test that not specifying a stderr file isn't broken.
 RUN: unset AFL_DRIVER_STDERR_DUPLICATE_FILENAME
 RUN: AFLDriverTest