runtime: use correct types in __go_ptrace shim

Make the types of the addr and data arguments in the __go_ptrace shim
match the types declared in Go and the types declared by the C ptrace
function, i.e., void*. This avoids a warning about an implicit
int-to-pointer cast on some platforms.

Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/262340

gcc/go/gofrontend/MERGE

@@ -1,4 +1,4 @@
-d36e74c7a1aa94fc5cf393dc705b8a1271cb01c7
+71e161daafa1e19c2c53e28fffc3954d88a4cdb2
 
 The first line of this file holds the git revision number of the last
 merge done from the gofrontend repository.

libgo/runtime/go-varargs.c

@@ -122,7 +122,7 @@ __go_syscall6(uintptr_t flag, uintptr_t a1, uintptr_t a2, uintptr_t a3,
 // a variadic function within glibc.
 
 long
-__go_ptrace(int request, pid_t pid, uintptr_t addr, uintptr_t data)
+__go_ptrace(int request, pid_t pid, void *addr, void *data)
 {
   return ptrace (request, pid, addr, data);
 }