ghc: Depends on ncurses to bootstrap for Linuxbrew
ghc: Depends on ncurses to bootstrap for Linuxbrew

Fix ghc-stage2: error while loading shared libraries: libncursesw.so.5

Closes Linuxbrew/linuxbrew#882.

Closes Linuxbrew/linuxbrew#978.

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

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