build: remove no_opkg

With the removal of ramips-rt305x, all targets come with opkg again.

scripts/copy_output.lua

@@ -83,7 +83,7 @@ lib.exec {'cp', kernel_debug_source, kernel_debug_dest}
 
 
 -- Copy opkg repo
-if lib.opkg and (env.GLUON_DEVICES or '') == '' then
+if (env.GLUON_DEVICES or '') == '' then
 	local package_prefix = string.format('gluon-%s-%s', lib.site_code, env.GLUON_RELEASE)
 	local function dest_dir(prefix)
 		return env.GLUON_PACKAGEDIR..'/'..prefix..'/'..bindir

scripts/target_config_lib.lua

@@ -151,13 +151,6 @@ lib.include(target)
 
 lib.check_devices()
 
-if not lib.opkg then
-	lib.config('SIGNED_PACKAGES', false)
-	lib.config('CLEAN_IPKG', true)
-	lib.config('ALL_NONSHARED', false)
-	lib.packages {'-opkg'}
-end
-
 if #lib.devices > 0 then
 	handle_target_pkgs(lib.target_packages)
 

scripts/target_lib.lua

@@ -28,7 +28,6 @@ M.target_packages = {}
 M.configs = {}
 M.devices = {}
 M.images = {}
-M.opkg = true
 
 
 local default_options = {
@@ -309,10 +308,6 @@ function F.sysupgrade_image(image, name, ext, options)
 	}
 end
 
-function F.no_opkg()
-	M.opkg = false
-end
-
 function F.defaults(options)
 	default_options = merge(default_options, options)
 end