Make vboot_reference build in MSVC command line environment.

This is a mostly NOOP change which modifies the source code
to compile cleanly in the MSVC command line build
environment.

A new makefile is introduced (msc/nmakefile) along with a
README.txt in the same directory explaining how to build
the code in the DOS window. As of this submission the build
is running in a 32 bit environment, the intention is to use
the same makefile for 64 bit builds in the future.

Enabling high compilation warnings level allowed to
identify a couple of bugs in the code which are being fixed.

Not all sources are being compiled in the MSVC environment,
only those in firmware/ and most of those in test/
subdirectories. The benchmark calculations require porting
of the timer facilities and are being postponed.

TEST

Built in DOS and linux environments. Ran unit tests in
linux environment.

Review URL: http://codereview.chromium.org/2809037

firmware/include/utility.h

@@ -52,10 +52,10 @@ void Free(void* ptr);
 int Memcmp(const void* src1, const void* src2, size_t n);
 
 /* Copy [n] bytes from [src] to [dest]. */
-void* Memcpy(void* dest, const void* src, size_t n);
+void* Memcpy(void* dest, const void* src, uint64_t n);
 
 /* Set [n] bytes starting at [s] to [c]. */
-void* Memset(void *dest, const uint8_t c, size_t n);
+void* Memset(void *dest, const uint8_t c, uint64_t n);
 
 /* Compare [n] bytes starting at [s1] with [s2] and return 0 if they match,
  * 1 if they don't. Time taken to perform the comparison is only dependent on