Sometimes when new features are introduced, a clean build is necessary, not
always though. Generally it is good to build from scratch from time to time
or when you get build problems like that.
Some terminology stuff too: A branch is technically on the blender svn
server. When you modify the local copy of blender you make a sort of
'private' branch. You can also make a diff file(patch) with the changes you
make and post it either in the patch tracker(recommended) or elsewhere.
Sometimes developers also request a branch on blender svn so that other
people can check their work too, especially if they work on extensive
changes/features.
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