distro-build: move a file out that is accessed directly

The "pack-all.rkt" file is needed before (and only before) the
distro-build package itself is ready, so move it to the "racket/src"
directory.
change default MSVC projects to Visual Studio 2010 (version 10) and up

Visual Studio 2008 is still supported by "9.sln" projects and
".vcproj" files, while ".sln" and ".vcxproj" work for 2010, 2012,
and 2013. The "build.bat" script detects which version of
Visual Studio is active and uses the appropriate ".sln" files.

The bad news is that we have two copies of each project until we
decide to drop support for Visual Studio 2008. (We had two copies
before, but one copy was unmaintained.) The good news is that
we have only 2 copies of each project, because recent versions of
Visual Studio are willing to use 2010 projects as-is.

Change project and related files to text instead of always CRLF,
because that seems to be ok for modern Windows tools.
fix `--enable-sgcdebug` build
fix glib build for Windows 64

The previous build attempted to cooperate with Valgrind in a way that
truncates a 64-bit address to a 32-bit address. Disable Valgrind
cooperation. (Other builds seem ok for now, but future rebuilds will
disable Valgrind cooperation for them, too.)