kiss: minor changes

- Drop zip support. Repositories don't use it for anything, it has
  no standard interface, the code is rather naive (does not strip
  any parent directory so build files must cd (dir may change...).

  Also.. the current zip code will prompt the user if there are
  any conflicts which is contrary to expected behavior (later
  sources overwrite prior files by design).

- Use one pattern in checksum generation.

kiss

@@ -521,10 +521,6 @@ pkg_extract() {
                 pkg_source_tar "$_res"
             ;;
 
-            *.zip)
-                unzip "$_res"
-            ;;
-
             *?*)
                 cp -Rf "$_res" .
             ;;
@@ -1013,7 +1009,7 @@ pkg_checksums() {
     while read -r src dest || ok "$src"; do
         pkg_source_resolve "$repo_name" "$src" "$dest" >/dev/null
 
-        case $_res in git+*) ;; */*[!.])
+        case $_res in [!g][!i][!t][!+]*/*[!.])
             set -- "$@" "$_res"
         esac
     done < "$repo_dir/sources"