fix: uutils-tar build + ncurses patch for ncurses-6.6

uutils-tar (WIP recipe):
- Pin to commit 8ecd8e0 (rust-version 1.85.0, compatible with our
  nightly-2025-10-03 toolchain)
- Fix nix-0.30.1 Redox bug: SaFlags_t declared as c_ulong but libc-0.2.184
  defines SA_*/sa_flags as c_int. Patch SaFlags_t to c_int.
- Enable nix pty module for Redox (relibc has all POSIX PTY functions)
- Add forkpty to libc-0.2.184 Redox module (relibc's pty.h defines it
  but libc crate doesn't expose it)

ncurses:
- Remove obsolete first hunk from redox.patch (cf_includedir lines
  already removed in ncurses-6.6). Keep second hunk (redox* platform
  detection).

recipes/libs/ncurses/redox.patch

@@ -1,15 +1,6 @@
 diff -ruwN source/configure source-new/configure
 --- source/configure	2022-11-06 04:13:26.000000000 +0700
-+++ source-new/configure	2026-02-17 13:42:38.449890407 +0700
-@@ -3480,8 +3480,6 @@
- echo $ECHO_N "checking if $CXX works... $ECHO_C" >&6
- 
- 		save_CPPFLAGS="$CPPFLAGS"
--		eval cf_includedir=${includedir}
--		CPPFLAGS="$CPPFLAGS -I${cf_includedir}"
- 
- cat >"conftest.$ac_ext" <<_ACEOF
- #line 3487 "configure"
++++ source-new/configure	2026-06-19 00:00:00.000000000 +0700
 @@ -6386,7 +6384,7 @@
  		fi
  		cf_cv_rm_so_locs=yes

recipes/wip/rs/uutils-tar/recipe.toml

@@ -1,6 +1,45 @@
 #TODO not compiled or tested
 [source]
 git = "https://github.com/uutils/tar"
-shallow_clone = true
+rev = "8ecd8e0bfde251de26df450efcec2da45135af9c"
 [build]
-template = "cargo"
+template = "custom"
+script = """
+DYNAMIC_INIT
+
+# nix-0.30.1 has three Redox bugs:
+# 1. SaFlags_t is c_ulong (u64) but libc-0.2.184 defines SA_* and sa_flags
+#    as c_int (i32). Fix: change SaFlags_t to c_int for Redox.
+# 2. The pty module is excluded for Redox (cfg(not(any(redox, fuchsia)))),
+#    but relibc now has all POSIX PTY functions. Fix: remove Redox exclusion.
+# 3. libc-0.2.184 doesn't expose forkpty for Redox, but relibc's pty.h
+#    defines it. Fix: add forkpty declaration to libc Redox module.
+for nix_src in /home/kellito/.cargo/registry/src/*/nix-0.30.1; do
+    if [ -f "$nix_src/src/sys/signal.rs" ]; then
+        # Fix 1: SaFlags_t type mismatch
+        sed -i 's/type SaFlags_t = libc::c_ulong;/type SaFlags_t = libc::c_int;/' \
+            "$nix_src/src/sys/signal.rs"
+    fi
+    if [ -f "$nix_src/src/lib.rs" ]; then
+        # Fix 2: Enable pty module for Redox
+        sed -i 's/#\\[cfg(not(any(target_os = "redox", target_os = "fuchsia")))\\]/#[cfg(not(target_os = "fuchsia"))]/' \
+            "$nix_src/src/lib.rs"
+    fi
+done
+
+# Fix 3: Add forkpty to libc Redox module (relibc's pty.h defines it)
+for libc_src in /home/kellito/.cargo/registry/src/*/libc-0.2.184; do
+    if [ -f "$libc_src/src/unix/redox/mod.rs" ] && ! grep -q 'pub fn forkpty' "$libc_src/src/unix/redox/mod.rs"; then
+        sed -i '/pub fn login_tty(fd: c_int) -> c_int;/a\\
+    pub fn forkpty(\\
+        amaster: *mut c_int,\\
+        name: *mut c_char,\\
+        termp: *const termios,\\
+        winp: *const crate::winsize,\\
+    ) -> c_int;' \
+            "$libc_src/src/unix/redox/mod.rs"
+    fi
+done
+
+cookbook_cargo
+"""