Revert "circle CI: add meson plain and release build types"

This broke CircleCI but since it didn't run for that build, no-one noticed.

This reverts commit 3bc31edd72.

circle.yml

@@ -13,24 +13,6 @@ libratbag_references:
       ninja -v -C build ${NINJA_ARGS}
     environment:
       MESON_PARAMS: --prefix=/usr
-  build_buildtype_plain: &build_buildtype_plain
-    name: Build
-    command: |
-      rm -rf build
-      meson build ${MESON_PARAMS}
-      meson configure build
-      ninja -v -C build ${NINJA_ARGS}
-    environment:
-      MESON_PARAMS: --prefix=/usr -Dbuildtype=plain
-  build_buildtype_release: &build_buildtype_release
-    name: Build
-    command: |
-      rm -rf build
-      meson build ${MESON_PARAMS}
-      meson configure build
-      ninja -v -C build ${NINJA_ARGS}
-    environment:
-      MESON_PARAMS: --prefix=/usr -Dbuildtype=release
   build_and_test: &build_and_test
     run:
       <<: *build_default
@@ -114,8 +96,6 @@ fedora_settings: &fedora_settings
     - *install
     - *check_install
     - *check_uninstall
-    - *build_builtype_plain
-    - *build_builtype_release
     - *export_logs
 
 
@@ -137,8 +117,6 @@ ubuntu_settings: &ubuntu_settings
     - *install
     - *check_install
     - *check_uninstall
-    - *build_builtype_plain
-    - *build_builtype_release
     - *export_logs
 
 doc_build: &doc_build