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/lib/cgptlib/include/cgptlib_internal.h

@@ -83,7 +83,7 @@ uint32_t HeaderCrc(GptHeader* h);
 /* Check entries.
  *
  * Returns 0 if entries are valid, 1 if invalid. */
-int CheckEntries(GptEntry* entries, GptHeader* h, uint64_t drive_sectors);
+int CheckEntries(GptEntry* entries, GptHeader* h);
 
 /* Check GptData, headers, entries.
  *