Update the Windows section of the README file.

The 64-bit Windows build instructions can be simplified since Cygwin
includes all the required MinGW64 packages. Also, the pthread DLL is
available as an individual download.

Update the WiX Toolset version to 3.7 and fix the URL since it's no
longer hosted at Sourceforge.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/README b/README
index 97f1a28..4c7b542 100644
--- a/README
+++ b/README
@@ -109,29 +109,21 @@
 Windows
 -------
 
-On Windows MinGW (http://www.mingw.org/) is required in order to
-build fio. To create an MSI installer package install WiX 3.6 from
-http://wix.sourceforge.net/releases/ and run dobuild.cmd from the
+On Windows Cygwin (http://www.cygwin.com/) is required in order to
+build fio. To create an MSI installer package install WiX 3.7 from
+http://wixtoolset.org and run dobuild.cmd from the
 os/windows directory.
 
-How to compile FIO on Windows 64 bits
- 
- 1. Install Cygwin - search for MinGW and install all MinGW packages.
- 2. Download x86_64-w64-mingw32-gcc-4.7.2-release-win64_rubenvb.7z (http://sourceforge.net/projects/mingw-w64/files) - Select Toolchains targeting Win64 -> 
-    Personal Builds -> rubenv -> gcc-4.7-release
- 3. Unzip the directory mingw64 to c:\ (c:\mingw64)
- 4. Add to PATH - c:\mingw64\bin
- 5. Copy c:\mingw64\bin\mingw32-make to c:\mingw64\bin\make.exe
- 6. Download pthreads-20100604.zip (http://sourceforge.net/projects/mingw-w64/files) - Select External binary packages (Win64 hosted) -> pthreads
- 7. Unzip pthreads-20100604.zip
- 8. Unzip pthreads-w64.zip
- 9. Copy pthreadGC2-w64.dll to c:\mingw64\bin
-10. Copy c:\mingw64\bin\pthreadGC2-w64.dll to c:\mingw64\bin\pthreadGC2.dll
-11. Open Cygwin Terminal
-12. Go to fio directory (source files)
-13. make clean
-14. ./configure
-15. make
+How to compile FIO on 64-bit Windows:
+
+ 1. Install Cygwin (http://www.cygwin.com/setup.exe). Install 'make' and all
+    packages starting with 'mingw64-i686' and 'mingw64-x86_64'.
+ 2. Download ftp://sourceware.org/pub/pthreads-win32/prebuilt-dll-2-9-1-release/dll/x64/pthreadGC2.dll
+    and copy to the fio source directory.
+ 3. Open the Cygwin Terminal.
+ 4. Go to the fio directory (source files).
+ 5. Run 'make clean'.
+ 6. Run 'make'.
 
 
 Command line