[PATCH] Use symbol database to maintain module dependence

[Bean]

Hi,

This patch add a new tool grub-symdb to manage symbol database and
update module dependence as required. The build process is greatly
simplified, moddep.lst, def-*.lst, und-*.lst are not generated
anymore. grub-symdb will read the module files and update modsym.lst
and moddep.lst automatically.

-- 
Bean

symdb.diff
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