isatty: add go:build lines equivalent to the +build lines

mhagger · mhagger · commit 46bc15ca7714 · 2021-11-01T23:46:12.000+01:00
The march of progress.
diff --git a/isatty/isatty_disabled.go b/isatty/isatty_disabled.go
@@ -1,3 +1,4 @@
+//go:build !isatty
 // +build !isatty
 
 package isatty
diff --git a/isatty/isatty_enabled.go b/isatty/isatty_enabled.go
@@ -1,3 +1,4 @@
+//go:build isatty
 // +build isatty
 
 package isatty
