Do not need a Mac-specific CPU header yet as there are no CPU-specific features

in use yet

src/core/support/cpu_posix.c

@@ -35,8 +35,6 @@
 
 #ifdef GPR_CPU_POSIX
 
-#include "src/core/support/cpu.h"
-
 #include <errno.h>
 #include <unistd.h>
 #include <string.h>