uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/networking/mpack/build-fix.patch

@@ -0,0 +1,29 @@
+diff -ubr mpack-1.6-orig/unixos.c mpack-1.6/unixos.c
+--- mpack-1.6-orig/unixos.c	2013-08-17 14:32:38.102772775 +0200
++++ mpack-1.6/unixos.c	2013-08-17 14:32:43.180792505 +0200
+@@ -38,10 +38,6 @@
+ #define MAXHOSTNAMELEN 64
+ #endif
+ 
+-extern int errno;
+-extern char *malloc();
+-extern char *getenv();
+-
+ int overwrite_files = 0;
+ int didchat;
+ 
+Only in mpack-1.6: unixos.o
+Only in mpack-1.6: unixunpk.o
+Only in mpack-1.6: uudecode.o
+diff -ubr mpack-1.6-orig/xmalloc.c mpack-1.6/xmalloc.c
+--- mpack-1.6-orig/xmalloc.c	2013-08-17 14:32:38.102772775 +0200
++++ mpack-1.6/xmalloc.c	2013-08-17 14:33:08.900892319 +0200
+@@ -24,7 +24,6 @@
+  */
+ #include <stdio.h>
+ #include <string.h>
+-extern char *malloc(), *realloc();
+ 
+ char *xmalloc (int size)
+ {
+Only in mpack-1.6: xmalloc.o

pkgs/tools/networking/mpack/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "mpack";
+  version = "1.6";
+
+  src = fetchurl {
+    url = "http://ftp.andrew.cmu.edu/pub/mpack/mpack-${version}.tar.gz";
+    sha256 = "0k590z96509k96zxmhv72gkwhrlf55jkmyqlzi72m61r7axhhh97";
+  };
+
+  patches = [ ./build-fix.patch ./sendmail-via-execvp.diff ];
+
+  postPatch = ''
+    for f in *.{c,man,pl,unix} ; do
+      substituteInPlace $f --replace /usr/tmp /tmp
+    done
+
+    # this just shuts up some warnings
+    for f in {decode,encode,part,unixos,unixpk,unixunpk,xmalloc}.c ; do
+      sed -i 'i#include <stdlib.h>' $f
+    done
+  '';
+
+  postInstall = ''
+    install -Dm644 -t $out/share/doc/mpack INSTALL README.*
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "Utilities for encoding and decoding binary files in MIME";
+    license = licenses.free;
+    platforms = platforms.linux;
+  };
+}

pkgs/tools/networking/mpack/sendmail-via-execvp.diff

@@ -0,0 +1,12 @@
+--- mpack-1.6/unixpk.c	2003-07-21 22:50:41.000000000 +0200
++++ mpack-1.6/unixpk.c	2018-09-16 12:57:14.104026964 +0200
+@@ -254,8 +254,9 @@
+ #ifdef SCO
+     execv("/usr/lib/mail/execmail", addr+start);
+ #else
++    execvp("sendmail", addr+start);
+     execv("/usr/lib/sendmail", addr+start);
+     execv("/usr/sbin/sendmail", addr+start);
+ #endif
+     perror("execv");
+     _exit(1);