gui: cups-config option

[T.J. Yang]

I think cups path  need to as an option to the ./configure script
instead of in  $PATH variable as shown below.

<snip>
if test -n "$have_cups"; then
 ac_cv_prog_have_cups="$have_cups" # Let the user override the test.
else
as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
for as_dir in $PATH
do
 IFS=$as_save_IFS
 test -z "$as_dir" && as_dir=.
 for ac_exec_ext in '' $ac_executable_extensions; do
 if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
   ac_cv_prog_have_cups="yes"
   echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5
   break 2
 fi
done
#


tj

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