reorganizing configuration

- static package configuration in `vars/pkgs`
  - loaded into the variable `pkgconfig` as part of `tasks/main.yml`

tasks/pkgs/go.yml

@@ -1,11 +1,5 @@
 # vim: set filetype=yaml.ansible :
 ---
-- ansible.builtin.include_vars:
-    file: go.yml
-    name: _go
-- ansible.builtin.set_fact:
-    pkgconfig_go: "{{ _go | ansible.builtin.combine(pkgconfig.go) }}"
-
-- name: append to pkgs
+- name: Append to pkgs
   ansible.builtin.set_fact:
-    srcpkgs: "{{ srcpkgs + [ 'go' ] }}"
+    src_pkgs: "{{ src_pkgs + ['go'] }}"