patch 8.2.2337: configure test for GTK only says "no"

Problem:    Configure test for GTK only says "no". (Harm te Hennepe)
Solution:   Hint that a -def package is needed. (closes #5229)
diff --git a/src/auto/configure b/src/auto/configure
index ebeed2c..bbfaafc 100755
--- a/src/auto/configure
+++ b/src/auto/configure
@@ -9561,6 +9561,8 @@
 	     sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\3/'`
     }
     else
+                  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GTK -dev package" >&5
+$as_echo_n "checking for GTK -dev package... " >&6; }
       no_gtk=yes
     fi
 
@@ -9814,6 +9816,8 @@
 	     sed 's/\([0-9]*\)\.\([0-9]*\)\.\([0-9]*\)/\3/'`
     }
     else
+                  { $as_echo "$as_me:${as_lineno-$LINENO}: checking for GTK -dev package" >&5
+$as_echo_n "checking for GTK -dev package... " >&6; }
       no_gtk=yes
     fi