Move `mruby-errno` to `stdlib-io.gembox`
This is because GEMs that use errno are currently limited to `mruby-io` and `mruby-socket`.
MODIFY
mrbgems/stdlib-io.gembox
mrbgems/stdlib-io.gembox
@@ -9,4 +9,7 @@ MRuby::GemBox.new do |conf|
# Use standard print/puts/p
conf.gem :core => "mruby-print"
+
+ # Use errno extension for a good mruby-io/mruby-socket experience
+ conf.gem :core => "mruby-errno"
end

MODIFY
mrbgems/stdlib.gembox
mrbgems/stdlib.gembox
@@ -54,7 +54,4 @@ MRuby::GemBox.new do |conf|
# Use class/module extension
conf.gem :core => "mruby-class-ext"
-
- # Use errno extension
- conf.gem :core => "mruby-errno"
end

Move `mruby-errno` to `stdlib-io.gembox`

This is because GEMs that use errno are currently limited to `mruby-io` and `mruby-socket`.