Revert "abook: fix compiling with gcc5"

This reverts commit 37918bdc7a09e34985c57a3fe64000edf92362b3.

has been fixed on master differently

-5
-5
pkgs/applications/misc/abook/default.nix
··· 19 19 nativeBuildInputs = [ pkgconfig ]; 20 20 buildInputs = [ ncurses readline ]; 21 21 22 - # Changed inline semantics in GCC5, need to export symbols for inline funcs 23 - postPatch = '' 24 - substituteInPlace database.c --replace inline extern 25 - ''; 26 - 27 22 meta = { 28 23 homepage = "http://abook.sourceforge.net/"; 29 24 description = "Text-based addressbook program designed to use with mutt mail client";