rubyPackages.gtk3: fix build, add missing dependencies

+8
+8
pkgs/development/ruby-modules/gem-config/default.nix
··· 46 tzdata, 47 icu, 48 libffi, 49 cmake, 50 libssh2, 51 openssl, ··· 548 fribidi 549 gobject-introspection 550 gtk3 551 cairo 552 harfbuzz 553 lerc
··· 46 tzdata, 47 icu, 48 libffi, 49 + libdeflate, 50 + xz, 51 + zstd, 52 + libwebp, 53 cmake, 54 libssh2, 55 openssl, ··· 552 fribidi 553 gobject-introspection 554 gtk3 555 + libdeflate 556 + xz 557 + libwebp 558 + zstd 559 cairo 560 harfbuzz 561 lerc