[Fuzzer] Fix function prototype in fuzzer::ExternalFunctions. [NFC]

The __sanitizer_acquire_crash_state function has int return type, but the
fuzzer's external function definitions give it bool.

Places where __sanitizer_acquire_crash_state is declared:

  include/sanitizer_common/sanitizer_interface_defs.h
  lib/sanitizer_common/sanitizer_interface_internal.h
  lib/sanitizer_common/sanitizer_common.cc
  lib/fuzzer/FuzzerExtFunctions.def (this is the only bool)

llvm-svn: 353596
GitOrigin-RevId: 6218b8e783ebea53d32a6200109085c02baabd03
diff --git a/FuzzerExtFunctions.def b/FuzzerExtFunctions.def
index 39c1b77..288a59c 100644
--- a/FuzzerExtFunctions.def
+++ b/FuzzerExtFunctions.def
@@ -28,7 +28,7 @@
 EXT_FUNC(__lsan_enable, void, (), false);
 EXT_FUNC(__lsan_disable, void, (), false);
 EXT_FUNC(__lsan_do_recoverable_leak_check, int, (), false);
-EXT_FUNC(__sanitizer_acquire_crash_state, bool, (), true);
+EXT_FUNC(__sanitizer_acquire_crash_state, int, (), true);
 EXT_FUNC(__sanitizer_install_malloc_and_free_hooks, int,
          (void (*malloc_hook)(const volatile void *, size_t),
           void (*free_hook)(const volatile void *)),