install: add dependency check

In case of a package already exist in $bin_dir if it isn't built in that
system (e.g. by copying the tar file manually from another kiss instance),
don't blindly install it but check if the depends are properly installed.
Otherwise the binaries won't run properly.

kiss

@@ -200,7 +200,9 @@ args() {
             pkg_checksum
             log "Generated checksums." ;;
 
-        i*) pkg_install ;;
+        i*) pkg_depends
+            pkg_install ;;
+
         l*) pkg_list "$2" ;;
         r*) pkg_remove || die "Package '$name' not installed" ;;
         u*) pkg_updates ;;