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/libraries/gnutls/nix-ssl-cert-file.patch

@@ -0,0 +1,19 @@
+allow overriding system trust store location via $NIX_SSL_CERT_FILE
+
+diff --git a/lib/system/certs.c b/lib/system/certs.c
+index 611c645..6ef6edb 100644
+--- a/lib/system/certs.c
++++ b/lib/system/certs.c
+@@ -369,6 +369,11 @@ gnutls_x509_trust_list_add_system_trust(gnutls_x509_trust_list_t list,
+ 					unsigned int tl_flags,
+ 					unsigned int tl_vflags)
+ {
+-	return add_system_trust(list, tl_flags|GNUTLS_TL_NO_DUPLICATES, tl_vflags);
++	tl_flags = tl_flags|GNUTLS_TL_NO_DUPLICATES;
++	const char *file = secure_getenv("NIX_SSL_CERT_FILE");
++	return file
++		? gnutls_x509_trust_list_add_trust_file(
++			list, file, NULL/*CRL*/, GNUTLS_X509_FMT_PEM, tl_flags, tl_vflags)
++		: add_system_trust(list, tl_flags, tl_vflags);
+ }
+