curses_wchar is set to true/false, so trying to assign it to the compiler
flags variable makes no sense.  it's already been set up the right value
at this point, so delete the assignment.

--- a/macros/curses.m4
+++ b/macros/curses.m4
@@ -130,7 +130,6 @@ AC_DEFUN([AC_CHECK_CURSES],[
 		else
 			AC_DEFINE(CURSES_WCHAR)
 			CURSES_WCHAR=true
-			CURSES_FLAGS=$curses_wchar
 			AC_SUBST(CURSES_FLAGS)
 		fi