Dependencies.hs: added 'gmp' to extralibs

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
point to own cabal fork
submodule update
submodule update
cabal submodule update
cabal submodule update
Warning-dirven Code-Maid
submoule update: forbid cabal to self update
cabal submodule update (rebase)
	modified:   cabal
	submodule update -> modified:   cabal
submodule update ->	modified:   cabal
	modified:   .gitmodules
	modified:   cabal
	modified:   cabal -> submodule update
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