Remove unused configure patch

ocaml-curses-configure-c99.patch

@@ -1,20 +0,0 @@
-Define NCURSES_WIDECHAR, so that <ncursesw/curses.h> actually declares
-the probed addnwstr function.  This follows Thomas Dickey's suggestion
-on the bug-ncurses list:
-
-  <https://lists.nongnu.org/archive/html/bug-ncurses/2023-03/msg00003.html>
-
-Submitted upstream: <https://savannah.nongnu.org/bugs/index.php?64109>
-
-diff --git a/configure.ac b/configure.ac
-index 15ca4087b5d9ee2b..24d5fa48960a5601 100644
---- a/configure.ac
-+++ b/configure.ac
-@@ -126,6 +126,7 @@ then
-     AC_MSG_CHECKING(for wide character support in ncurses library)
-     AC_TRY_LINK(
-       [#include <wchar.h>
-+       #define NCURSES_WIDECHAR 1
-        #include CURSES_HEADER
-       ],
-       [wchar_t wch = 0;