win32: update build instructions with correct CRT version

As stated in http://msdn.microsoft.com/en-us/library/cc664727.aspx, when you
compile an application with MSVC 2008 SP1 it is bound by default to the
original CRT version (9.0.21022.8). This is the case for Python 2.6 up to 3.1.
If the wrong CRT version is embedded in the Inno Setup installer, with a PC
that does not have the MSVC 2008 redistributable package installed, hg will
refuse to launch with an error: "the system cannot execute the specified
program".

contrib/win32/win32-build.txt

@@ -19,11 +19,11 b' matching the mercurial version you want '
   mfc71.dll (just download, don't install; not needed for Python 2.6)
       http://starship.python.net/crew/mhammond/win32/
 
-  Visual C++ 2008 SP1 redistributable package (needed for >= Python 2.6 or if you compile with MSVC)
+  Visual C++ 2008 redistributable package (needed for >= Python 2.6 or if you compile with MSVC)
     for 32-bit:
-      http://www.microsoft.com/downloads/details.aspx?FamilyID=A5C84275-3B97-4AB7-A40D-3802B2AF5FC2
+      http://www.microsoft.com/downloads/details.aspx?FamilyID=9b2da534-3e03-4391-8a4d-074b9f2bc1bf
     for 64-bit:
-      http://www.microsoft.com/downloads/details.aspx?familyid=BA9257CA-337F-4B40-8C14-157CFDFFEE4E
+      http://www.microsoft.com/downloads/details.aspx?familyid=bd2a6171-e2d6-4230-b809-9a8d7548c1b6
       
   The py2exe distutils extension
       http://sourceforge.net/projects/py2exe/
@@ -65,7 +65,7 b' If you want to create a file named setup'
 compiler=mingw32
 you can skip the first build step.
 
-Building instructions with MSVC 2008 SP1 Express Edition:
+Building instructions with MSVC 2008 Express Edition:
   for 32-bit:
     "C:\Program Files\Microsoft Visual Studio 9.0\VC\vcvarsall.bat" x86
     python setup.py py2exe -b 2
@@ -80,15 +80,15 b' directory that just got created.'
 
 If you are using Python 2.6 or later, or if you are using MSVC 2008 to compile
 mercurial, you must include the C runtime libraries in the installer. To do so,
-install the Visual C++ 2008 SP1 redistributable package. Then in your
-windows\winsxs folder, locate the folder containing the dlls version 9.0.30729.
-For x86, it should be named like x86_Microsoft.VC90.CRT_(...)_9.0.30729(...).
-For x64, it should be named like amd64_Microsoft.VC90.CRT_(...)_9.0.30729(...).
+install the Visual C++ 2008 redistributable package. Then in your windows\winsxs
+folder, locate the folder containing the dlls version 9.0.21022.8.
+For x86, it should be named like x86_Microsoft.VC90.CRT_(...)_9.0.21022.8(...).
+For x64, it should be named like amd64_Microsoft.VC90.CRT_(...)_9.0.21022.8(...).
 Copy the files named msvcm90.dll, msvcp90.dll and msvcr90.dll into the dist
 directory.
 Then in the windows\winsxs\manifests folder, locate the corresponding manifest
-file (x86_Microsoft.VC90.CRT_(...)_9.0.30729(...).manifest for x86,
-amd64_Microsoft.VC90.CRT_(...)_9.0.30729(...).manifest for x64), copy it in the
+file (x86_Microsoft.VC90.CRT_(...)_9.0.21022.8(...).manifest for x86,
+amd64_Microsoft.VC90.CRT_(...)_9.0.21022.8(...).manifest for x64), copy it in the
 dist directory and rename it to Microsoft.VC90.CRT.manifest.
 
 Before building the installer, you have to build Mercurial HTML documentation