Fix build failure

IS_APPLE_TVOS macro is always defined but we must check its value of
(IS_APPLE_TVOS) instead of just whether it's defined.

Co-Authored-By: [email protected]

Author: abhijeetk

fuzztest/internal/subprocess.cc

@@ -316,7 +316,7 @@ RunResults RunCommand(
   FUZZTEST_INTERNAL_CHECK(
       false,
       "Subprocess library not implemented on older Android NDK versions yet");
-#elif defined(IS_APPLE_TVOS)
+#elif IS_APPLE_TVOS
   FUZZTEST_INTERNAL_CHECK(
       false, "Subprocess library not implemented on Apple tvOS yet");
 #else