patch 8.2.1442: outdated references to the Mac Carbon GUI

Problem:    Outdated references to the Mac Carbon GUI.
Solution:   Remove or update references. (Yee Cheng Chin, closes #6703)
diff --git a/src/auto/configure b/src/auto/configure
index 5cef555..c85dec9 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -9246,8 +9246,7 @@
     auto)	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: auto - disable GUI support for Mac OS" >&5
 $as_echo "auto - disable GUI support for Mac OS" >&6; } ;;
     *)		{ $as_echo "$as_me:${as_lineno-$LINENO}: result: Sorry, $enable_gui GUI is not supported" >&5
-$as_echo "Sorry, $enable_gui GUI is not supported" >&6; }
-		SKIP_CARBON=YES ;;
+$as_echo "Sorry, $enable_gui GUI is not supported" >&6; } ;;
   esac
 else