New res_compiler coming from kiwix-lib need the outdir.

static/server/meson.build

@@ -2,7 +2,9 @@
 server_resources = custom_target('resources',
   input: 'resources_list.txt',
   output: ['server-resources.cpp', 'server-resources.h'],
-  command:[res_compiler, '--cxxfile', '@OUTPUT0@', '--hfile', '@OUTPUT1@', '@INPUT@'],
+  command:[res_compiler,
+           '--cxxfile', '@OUTPUT0@',
+           '--hfile', '@OUTPUT1@', '@INPUT@', '@OUTDIR@'],
   build_always: true
 )