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/servers/hylafaxplus/post-patch.sh

@@ -0,0 +1,18 @@
+# Replace strange default value for the nobody account.
+if test -n "@maxuid@"
+then
+  for f in util/faxadduser.c hfaxd/manifest.h
+  do
+    substituteInPlace "$f" --replace 60002 "@maxuid@"
+  done
+fi
+
+# Replace hardcoded `PATH` variables with proper paths.
+# Note: `findutils` is needed for `faxcron`.
+substituteInPlace faxcover/edit-faxcover.sh.in \
+  --replace 'PATH=/bin' 'PATH="@faxcover_binpath@"'
+substituteInPlace etc/faxsetup.sh.in \
+  --replace 'PATH=/bin' 'PATH="@faxsetup_binpath@"'
+
+# Create `config.site`
+substitute "@configSite@" config.site --subst-var out