README.win32: More updates on GLib usage

Remove mentions of the pre-configured glibconfig.h.win32, as it does not
exist anymore.  Also make the 2008/x64 build workarounds clearer.

README.win32

@@ -150,14 +150,11 @@ library.
 
 The DLL generated by either compiler is binary compatible with the
 other one. Thus one either has to manually edit glibconfig.h
-afterwards, or use the supplied glibconfig.h.win32 which has been
-produced by running configure twice, once using gcc and once using
-MSVC, and merging the resulting files with diff -D.
+afterwards.
 
 For MSVC7 and later (Visual C++ .NET 2003, Visual C++ 2005, Visual C++
 2008 etc) it is preferred to use specific builds of GLib DLLs that use
-the same C runtime as the code that uses GLib. Such DLLs should be
-named differently than the ones that use msvcrt.dll.
+the same C runtime as the code that uses GLib.
 
 For GLib, the DLL that uses msvcrt.dll is called libglib-2.0-0.dll,
 and the import libraries libglib-2.0.dll.a and glib-2.0.lib. Note that
@@ -201,5 +198,5 @@ for /r %f in (*.exe.manifest) do if exist $(PREFIX)\bin\%~nf mt /manifest %f $(P
  is caused by an optimization issue in the 2008 x64 compiler.  You need to use Task Manager to
  remove all running instances of cl.exe, which will cause the build process to terminate.  Update
  the build flags of the sources that hang on compilation by changing its "/O2" flag to "/O1", and
- things should continue to build normally.  At the time of writing, this is needed for compiling
- glib/gtestutils.c,  gio/gsettings.c and gio/gsettingsschema.c
+ retry the build, where things should continue to build normally.  At the time of writing, this
+ is needed for compiling glib/gtestutils.c,  gio/gsettings.c and gio/gsettingsschema.c