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/os-specific/linux/bcc/libbcc-path.patch

@@ -0,0 +1,11 @@
+--- source.org/src/python/bcc/libbcc.py	2018-05-13 08:35:06.850522883 +0100
++++ source/src/python/bcc/libbcc.py	2018-05-13 08:36:24.602733151 +0100
+@@ -14,7 +14,7 @@
+ 
+ import ctypes as ct
+ 
+-lib = ct.CDLL("libbcc.so.0", use_errno=True)
++lib = ct.CDLL("@out@/lib/libbcc.so.0", use_errno=True)
+ 
+ # keep in sync with bpf_common.h
+ lib.bpf_module_create_b.restype = ct.c_void_p