mac: Suppress partial availability warnings.

util/mach/exception_types.cc

Index: util/mach/exception_types.cc
diff --git a/util/mach/exception_types.cc b/util/mach/exception_types.cc
index 4f6f8f75a87d69e8f30241d1e4278fcb5040ab8d..0199b3145a7cd1d6e3823860136ebe98b28a5d0e 100644
--- a/util/mach/exception_types.cc
+++ b/util/mach/exception_types.cc
@@ -35,6 +35,10 @@ extern "C" {
 int proc_get_wakemon_params(pid_t pid, int* rate_hz, int* flags)
     __OSX_AVAILABLE_STARTING(__MAC_10_9, __IPHONE_7_0);
 
+// Redeclare the method without the availability annotation to suppress the
+// -Wpartial-availability warning.
+int proc_get_wakemon_params(pid_t pid, int* rate_hz, int* flags);
+
 }  // extern "C"
 
 #else