Try and fix openbsd st.ht build.

Oneline meson configs, remove extra `cd janet`.

.builds/openbsd.yml

@@ -6,42 +6,25 @@ packages:
 - meson
 tasks:
 - build: |
-    # Makefile testing on BSD.
-    cd janet
+    cd janet # Makefile testing on BSD.
     gmake
     gmake test
     doas gmake install
     gmake test-install
     doas gmake uninstall
     rm -rf build # clean up
-    # meson min testing
-    meson setup build --buildtype=release
+    meson setup build --buildtype=release -Dsingle_threaded=true -Dnanbox=false -Ddynamic_modules=false -Ddocstrings=false -Dnet=false -Dsourcemaps=false -Dpeg=false -Dassembler=false -Dint_types=false -Dtyped_array=false -Dreduced_os=true # meson minimum build
     cd build
-    meson configure -Dsingle_threaded=true
-    meson configure -Dnanbox=false
-    meson configure -Ddynamic_modules=false
-    meson configure -Ddocstrings=false
-    meson configure -Dnet=false
-    meson configure -Dsourcemaps=false
-    meson configure -Dpeg=false
-    meson configure -Dassembler=false
-    meson configure -Dint_types=false
-    meson configure -Dtyped_array=false
-    meson configure -Dreduced_os=true
     ninja # will not pass tests but should build
     cd ..
     rm -rf build # clean up
-    # meson (with prf)
-    meson setup build --buildtype=release
+    meson setup build --buildtype=release -Dprf=true # meson (with prf)
     cd build
-    meson configure -Dprf=true
     ninja
     ninja test
     cd ..
     rm -rf build
-    # meson (default build)
-    cd janet
-    meson setup build --buildtype=release
+    meson setup build --buildtype=release # meson (default build)
     cd build
     ninja
     ninja test