Merge pull request #19479 from sternenseemann/master

libhttpseverywhere: build api documentation

pkgs/development/libraries/libhttpseverywhere/default.nix

···
     meson.py --prefix "$out" ..
   '';
 
-  buildPhase = "ninja";
+  buildPhase = ''
+    ninja
+    ninja devhelp
+  '';
 
   installPhase = "ninja install";