tools: add cpio

mediatek-mt7622 as well as mediatek-mt7623 require CPIO to create their
initramfs images. So build CPIO as part of the host toolchain.

Signed-off-by: David Bauer <mail@david-bauer.net>

tools/cpio/patches/001-duplicate-program-name.patch

@@ -0,0 +1,20 @@
+author	Sergey Poznyakoff <gray@gnu.org>
+
+https://git.savannah.gnu.org/cgit/cpio.git/commit/?id=641d3f489cf6238bb916368d4ba0d9325a235afb
+
+* src/global.c: Remove superfluous declaration of program_name
+
+diff --git a/src/global.c b/src/global.c
+index fb3abe9..acf92bc 100644
+--- a/src/global.c
++++ b/src/global.c
+@@ -184,9 +184,6 @@ unsigned int warn_option = 0;
+ /* Extract to standard output? */
+ bool to_stdout_option = false;
+ 
+-/* The name this program was run with.  */
+-char *program_name;
+-
+ /* A pointer to either lstat or stat, depending on whether
+    dereferencing of symlinks is done for input files.  */
+ int (*xstat) ();