meson: fix option name lookup in build file

meson.build

@@ -72,7 +72,7 @@ foreach dep: [
     d = dependency(dep[0], version: dep[1] != '' ? dep[1]: '>=0',
                    required: false)
 
-    optname = 'enable_@0@'.format(dep[0].split('-')[0])
+    optname = dep[0].split('-')[0]
     if d.found() and not get_option(optname).disabled()
         deps += d
         conf.set('WITH_@0@'.format(dep[0].split('-')[0].to_upper()), '1')