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/applications/networking/browsers/chromium/patches/no-build-timestamps.patch

@@ -0,0 +1,17 @@
+--- chromium-70.0.3538.67/build/compute_build_timestamp.py.orig	2018-11-02 16:00:34.368933077 +0200
++++ chromium-70.0.3538.67/build/compute_build_timestamp.py	2018-11-08 04:06:21.658105129 +0200
+@@ -94,6 +94,14 @@
+       'build_type', help='The type of build', choices=('official', 'default'))
+   args = argument_parser.parse_args()
+ 
++  # I don't trust LASTCHANGE magic, and I definelly want something deterministic here
++  SOURCE_DATE_EPOCH = os.getenv("SOURCE_DATE_EPOCH", None)
++  if SOURCE_DATE_EPOCH is not None:
++    print(SOURCE_DATE_EPOCH)
++    return 0
++  else:
++    raise RuntimeError("SOURCE_DATE_EPOCH not set")
++
+   # The mtime of the revision in build/util/LASTCHANGE is stored in a file
+   # next to it. Read it, to get a deterministic time close to "now".
+   # That date is then modified as described at the top of the file so that