[ci] Install 'base-devel' on ArchLinux CI bot

.circleci/config.yml

@@ -63,7 +63,7 @@ jobs:
       - image: archlinux/base
     steps:
       - checkout
-      - run: pacman --noconfirm -Syu freetype2 cairo icu gettext gobject-introspection gcc gcc-libs glib2 graphite pkg-config ragel python python-pip make which
+      - run: pacman --noconfirm -Syu freetype2 cairo icu gettext gobject-introspection gcc gcc-libs glib2 graphite pkg-config ragel python python-pip make which base-devel
       - run: pip install flake8 fonttools
       - run: flake8 . --count --select=E901,E999,F821,F822,F823 --show-source --statistics
       # C??FLAGS are not needed for a regular build