slang: disable pcre module

Both Debian [1] and Fedora [2] did this change a while ago.
`pcre` 1.x is deprecated and should not be used.

[1] https://salsa.debian.org/debian/slang2/-/commit/8d9223409e45b5aee65e7278635daa1fcc880429
[2] https://src.fedoraproject.org/rpms/slang/blob/rawhide/f/slang.spec#_124

pkgs/by-name/sl/slang/package.nix

@@ -5,7 +5,6 @@
   libiconv,
   libpng,
   ncurses,
-  pcre,
   readline,
   zlib,
   writeScript,
@@ -36,7 +35,7 @@ stdenv.mkDerivation rec {
   '';
 
   configureFlags = [
-    "--with-pcre=${pcre.dev}"
+    "--without-pcre"
     "--with-png=${libpng.dev}"
     "--with-readline=${readline.dev}"
     "--with-z=${zlib.dev}"
@@ -44,7 +43,6 @@ stdenv.mkDerivation rec {
 
   buildInputs = [
     libpng
-    pcre
     readline
     zlib
   ] ++ lib.optionals (stdenv.hostPlatform.isDarwin) [ libiconv ];