meson: link with libdl

Change-Id: I010069c97af03b8128c22765eb5814b2fb0a59c2
Gitlab: #254

meson.build

@@ -137,6 +137,7 @@ if get_option('plugins')
             '-DENABLE_LIBXML2=OFF'
         ]).dependency('archive_static')
     endif
+    depdl = meson.get_compiler('cpp').find_library('dl', required: false)
 else
     conf.set('ENABLE_PLUGIN', false)
 endif

src/meson.build

@@ -268,7 +268,7 @@ if conf.get('ENABLE_PLUGIN')
         'plugin/pluginloaderdl.cpp',
         'plugin/pluginmanager.cpp'
     )
-    libjami_dependencies += deplibarchive
+    libjami_dependencies += [deplibarchive, depdl]
 endif
 
 libjami = library('jami',