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/security/sbsigntool/autoconf.patch

@@ -0,0 +1,29 @@
+--- sbsigntools/configure.ac	2018-09-25 10:30:00.878766256 -0500
++++ configure.ac.new	2018-09-25 10:34:56.231277375 -0500
+@@ -71,15 +71,16 @@
+ # no consistent view of where gnu-efi should dump the efi stuff, so find it
+ ##
+ for path in /lib /lib64 /usr/lib /usr/lib64 /usr/lib32 /lib/efi /lib64/efi /usr/lib/efi /usr/lib64/efi; do
+-    if test -e $path/crt0-efi-$EFI_ARCH.o; then
+-       CRTPATH=$path
++    if test -e @@NIX_GNUEFI@@/$path/crt0-efi-$EFI_ARCH.o; then
++       CRTPATH=@@NIX_GNUEFI@@/$path
++       break
+     fi
+ done
+ if test -z "$CRTPATH"; then
+    AC_MSG_ERROR([cannot find the gnu-efi crt path])
+ fi
+ 
+-EFI_CPPFLAGS="-I/usr/include/efi -I/usr/include/efi/$EFI_ARCH \
++EFI_CPPFLAGS="-I@@NIX_GNUEFI@@/include/efi -I@@NIX_GNUEFI@@/include/efi/$EFI_ARCH \
+  -DEFI_FUNCTION_WRAPPER"
+ CPPFLAGS_save="$CPPFLAGS"
+ CPPFLAGS="$CPPFLAGS $EFI_CPPFLAGS"
+@@ -90,5 +91,5 @@
+ AC_SUBST(CRTPATH, $CRTPATH)
+ 
+ AC_CONFIG_FILES([Makefile src/Makefile lib/ccan/Makefile]
+-		[docs/Makefile tests/Makefile])
++		[docs/Makefile])
+ AC_OUTPUT