Make vboot_reference build in MSVC command line environment.

firmware/stub/utility_stub.c

Index: firmware/stub/utility_stub.c
diff --git a/firmware/stub/utility_stub.c b/firmware/stub/utility_stub.c
index a41e3a3d3ca08c75ce8bc4c07fcae08263d5794c..1445008ce1ffd5cf0b8188f5ff96d34e6e8bb701 100644
--- a/firmware/stub/utility_stub.c
+++ b/firmware/stub/utility_stub.c
@@ -48,13 +48,14 @@ int Memcmp(const void* src1, const void* src2, size_t n) {
   return memcmp(src1, src2, n);
 }
 
-void* Memcpy(void* dest, const void* src, size_t n) {
-  return memcpy(dest, src, n);
+void* Memcpy(void* dest, const void* src, uint64_t n) {
+  return memcpy(dest, src, (size_t)n);
 }
 
-void* Memset(void* dest, const uint8_t c, size_t n) {
+void* Memset(void* d, const uint8_t c, uint64_t n) {
+  uint8_t *dest = d; /* the only way to keep both cl and gcc happy */
   while (n--) {
-    *((uint8_t*)dest++) = c;
+    *dest++ = c;
   }
   return dest;
 }