Rockbox Utility: add description and helper code for VS.

For building Rockbox Utility with Visual Studio some extra steps need to be
done. Visual Studio is also lacking some C99 standard headers. Add the missing
headers (from clang / msinttypes) and a Makefile to automate the extra steps.
See the README file for other requirements and necessary steps.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@31407 a1c6a512-1295-4272-9138-f99709370657

rbutil/rbutilqt/msvc/README

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+Rockbox Utility with Visual Studio
+==================================
+
+This document describes how to build Rockbox Utility using Visual Studio.
+
+*Note*: building with Visual Studio is only useful for debugging / development.
+Since several parts used by Rockbox Utility can't be compiled using Visual
+Studio at all using DLLs is required. For distributing we want a statically
+linked binary, which does not work this way. Building with MinGW is much easier
+in general, since using VS requires the use of MinGW as well.
+
+All of the steps described below are to be performed in the folder this file is
+located in on a command prompt (cmd.exe on Windows). All paths stated are the
+default paths on an english Windows XP setup. You might need to adjust them to
+your system.
+
+Steps
+-----
+Building with VS requires several steps:
+1. Prepare your build environment
+2. Build DLLs using MinGW for the parts that cannot be compiled with VS and
+   create LIB files from the DLLs. This requires using tools from VS.
+3. Create a VS project file
+4. Build the remaining code using VS.
+
+Preparing the build environment
+-------------------------------
+The DLLs can be cross compiled on Linux. Everything else has to be done on
+Windows. If you decide to cross compile, you need to install:
+- Linux
+  - MinGW toolchain
+- Windows
+  - MinGW with (at least) the mingw32-make package.
+  - Visual Studio 2008 (other versions might work but are not tested. Express
+    version is sufficient).
+  - Windows Platform SDK (in case you're using the Express version of VS,
+    otherwise this is included in VS)
+  - Qt SDK for VS.
+
+If you decide to not cross compile the DLLs you need to install additionally to
+the programs listed above on Windows:
+- MinGW with the following packages (and their dependencies):
+  - mingw32-gcc
+  - mingw32-make
+  - msys-coreutils
+  - msys-sed
+  - msys-bash
+  - msys-grep
+
+On Windows, open a command prompt and set up your path:
+
+  set PATH=c:\MinGW\bin;c:\MinGW\msys\1.0\bin;%PATH%
+  c:\Program Files\Microsoft Visual Studio 9\Common7\Tools\vsvars.bat
+
+
+Building DLLs and LIBs
+----------------------
+On Linux, run
+
+  make CROSS=i686-pc-mingw32-
+
+Adjust the CROSS variable to the prefix of your cross compiler. This will
+create the DLL files only. Copy the resulting DLL and DEF files to the Windows
+machine, then proceed with the Windows instructions below. The Makefile will
+not remake the DLLs if they are already present.
+
+On Windows, run
+
+  mingw32-make
+
+This will build the DLL files (if missing) and create LIB files from them.
+
+
+Create a VS project file
+------------------------
+To create a project file for VS, run
+
+  c:\QtSDK\Desktop\Qt\4.7.4\msvc2008\bin\qmake.exe -tp vc
+
+This creates a file RockboxUtility.vcproj.
+
+
+Build using VS
+--------------
+Open the generated project file and build as usual with VS.
+
+
+LICENSE INFORMATION
+===================
+This folder contains additional files necessary for building.
+
+- stdbool.h: taken form clang 2.8
+- stdint.h, inttypes.h: taken from the msinttypes project
+  (http://code.google.com/p/msinttypes) r26.
+
+See the source files for detailed license information.
+