ghc: Fix for Linuxbrew
ghc: Fix for Linuxbrew

Fix the error:
error while loading shared libraries: libgmp.so.3:
cannot open shared object file: No such file or directory

Closes Linuxbrew/linuxbrew#543.
Closes Linuxbrew/linuxbrew#770.

Signed-off-by: Shaun Jackman <b580dab3251a9622aba3803114310c23fdb42900@gmail.com>

Linuxbrew/homebrew-core,maxim-belkin/homebrew-core,Linuxbrew/homebrew-core,LinuxbrewTestBot/homebrew-core,maxim-belkin/homebrew-core,rwhogg/homebrew-core,rwhogg/homebrew-core,LinuxbrewTestBot/homebrew-core,forevergenin/homebrew-core,forevergenin/homebrew-core