XXX push upstream

Index: meson.build
--- meson.build.orig
+++ meson.build
@@ -85,7 +85,11 @@ if not libsoup2.found() and not libsoup3.found()
 endif
 
 libmath = cc.find_library('m', required: false)
-libdl = cc.find_library('dl')
+if build_machine.system() == 'openbsd'
+  libdl = []
+else
+  libdl = cc.find_library('dl')
+endif
 
 if get_option('man')
   a2x = find_program('a2x')