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/development/tools/flatpak-builder/respect-xml-catalog-files-var.patch

@@ -0,0 +1,13 @@
+--- a/acinclude.m4
++++ b/acinclude.m4
+@@ -40,8 +40,8 @@
+ [
+   AC_REQUIRE([JH_PATH_XML_CATALOG],[JH_PATH_XML_CATALOG(,[:])])dnl
+   AC_MSG_CHECKING([for ifelse([$2],,[$1],[$2]) in XML catalog])
+-  if $jh_found_xmlcatalog && \
+-     AC_RUN_LOG([$XMLCATALOG --noout "$XML_CATALOG_FILE" "$1" >&2]); then
++  # empty argument forces libxml to use XML_CATALOG_FILES variable
++  if AC_RUN_LOG([$XMLCATALOG --noout "" "$1" >&2]); then
+     AC_MSG_RESULT([found])
+     ifelse([$3],,,[$3
+ ])dnl