[Gta04-owner] Building QtMoko v45

[Rainer Blome]

For reliability, the build instructions should be amended with the checkout and
"submodule sync" commands. The checkout command can affect the contents
of ".gitmodules", which affects all submodule commands.
To ensure a consistent state of your directory tree,
you need to issue all three submodule commands *after* every change
of branch (checkout).  It may help to use a script or an alias to do that.

----
cd qtmoko
git checkout gta04_master
git submodule init
git submodule sync
git submodule update --init --recursive
----

When the sync command and init option are not used upon subsequent checkouts, 
"git submodule update" can "get stuck" and refuse to proceed because of "unknown 
commits".

Rainer