dev-util/cdecl: Add new package

See #570454, this package is a continuation of dev-util/cdecl::gentoo
from the main repo's 7c81cf86, from a different up-to-date source.

Signed-off-by: Marco Sirabella <marco@sirabella.org>

dev-util/cdecl/files/cdecl-9.10-tinfo.patch

@@ -0,0 +1,26 @@
+From 948525fd0ca553d4fce84fc5b080278494c4f224 Mon Sep 17 00:00:00 2001
+From: Marco Sirabella <marco@sirabella.org>
+Date: Tue, 18 May 2021 17:43:35 -0400
+Subject: [PATCH] Search for the library containing: tigetnum (tinfo)
+
+For me, `tigetnum` is found in tinfo.so, ncurses has been split off into
+tinfo due to being compiled with the --with-termlib flag.
+
+pkg-config --libs automatically reports this, but this check is good
+enough to catch this specific problem.
+---
+ configure.ac | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/configure.ac b/configure.ac
+index b617f9b1..b892ffea 100644
+--- a/configure.ac
++++ b/configure.ac
+@@ -113,6 +113,7 @@ AC_CHECK_FUNCS([geteuid getpwuid fmemopen strsep])
+ AC_SEARCH_LIBS([endwin],[curses ncurses])
+ AC_SEARCH_LIBS([readline],[readline])
+ AC_SEARCH_LIBS([add_history],[readline history])
++AC_SEARCH_LIBS([tigetnum],[curses ncurses tinfo])
+ 
+ # If readline wasn't disabled by the user, does it actually exist and is it a
+ # proper readline?