Eliminate checks of user-specified Tcl/Tk interpreter.

Do not make the checks on the Tcl/Tk interpreter passed by
'--with-tcltk=/path/to/wish' configure option: user is free to pass
anything.

Signed-off-by: Eygene Ryabinkin <rea-git@codelabs.ru>
Signed-off-by: Junio C Hamano <junkio@cox.net>

configure.ac

@@ -102,12 +102,10 @@ if test -z "$NO_TCLTK"; then
   elif test "$with_tcltk" = "yes"; then
   # Tcl/Tk check requested.
     AC_CHECK_PROGS(TCLTK_PATH, [wish], )
-  elif test -x "$with_tcltk"; then
+  else
     AC_MSG_RESULT([Using Tcl/Tk interpreter $with_tcltk])
     TCLTK_PATH="$with_tcltk"
     AC_SUBST(TCLTK_PATH)
-  else
-    AC_MSG_ERROR([Tcl/Tk interpreter was not found in $with_tcltk])
   fi
 fi