Lua: Fix unresolved symbols in shared library by linking with libdl.so (#11260)

The current lua package.py does not link with libdl.so, so you get
unresolved symbols while linking with lua. This PR adds libdl to fix
the issue.

var/spack/repos/builtin/packages/lua/package.py

@@ -58,7 +58,8 @@ def install(self, spec, prefix):
              'install')
 
         static_to_shared_library(join_path(prefix.lib, 'liblua.a'),
-                                 arguments=['-lm'], version=self.version,
+                                 arguments=['-lm', '-ldl'],
+                                 version=self.version,
                                  compat_version=self.version.up_to(2))
 
         # compatibility with ax_lua.m4 from autoconf-archive