runtime: fix print - no %v in C

R=r
CC=golang-dev
https://golang.org/cl/4280061

src/pkg/runtime/freebsd/mem.c

@@ -53,7 +53,7 @@ runtime·SysMap(void *v, uintptr n)
 	if(sizeof(void*) == 8) {
 		p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
 		if(p != v) {
-			runtime·printf("runtime: address space conflict: map(%v) = %v\n", v, p);
+			runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p);
 			runtime·throw("runtime: address space conflict");
 		}
 		return;

src/pkg/runtime/linux/mem.c

@@ -59,7 +59,7 @@ runtime·SysMap(void *v, uintptr n)
 	if(sizeof(void*) == 8) {
 		p = runtime·mmap(v, n, PROT_READ|PROT_WRITE|PROT_EXEC, MAP_ANON|MAP_PRIVATE, -1, 0);
 		if(p != v) {
-			runtime·printf("runtime: address space conflict: map(%v) = %v\n", v, p);
+			runtime·printf("runtime: address space conflict: map(%p) = %p\n", v, p);
 			runtime·throw("runtime: address space conflict");
 		}
 		return;