Fully drop stdconfig

CHANGELOG.md

@@ -14,6 +14,7 @@ this project uses date-based 'snapshot' version identifiers.
 - Restore epoch settings for `dvitopdf()`
 - Use plural form of variable `ps2pdfopts` consistently in code and doc, and 
   retain compatibility with singular form `ps2pdfopt` (issue #275)
+- Remove the last trace of dropped variable `stdconfig`
 
 ## [2023-02-20]
 

l3build.lua

@@ -123,9 +123,9 @@ epoch = normalise_epoch(epoch)
 --
 
 -- When we have specific files to deal with, only use explicit configs
--- (or just the std one)
+-- (or just the default one)
 if options["names"] then
-  checkconfigs = options["config"] or {stdconfig}
+  checkconfigs = options["config"] or {"build"}
 else
   checkconfigs = options["config"] or checkconfigs
 end