bitcoin-abc: add mainProgram

Signed-off-by: Christina Sørensen <christina@cafkafk.com>

+1
+1
pkgs/applications/blockchains/bitcoin-abc/default.nix
··· 72 72 license = licenses.mit; 73 73 broken = stdenv.isDarwin; 74 74 platforms = platforms.unix; 75 + mainProgram = "bitcoin-cli"; 75 76 }; 76 77 }