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/build-support/mono-dll-fixer/dll-fixer.pl

@@ -0,0 +1,32 @@
+#! @perl@ -w
+
+use strict;
+
+my @paths = split ' ', $ENV{"ALL_INPUTS"};
+
+open IN, "<$ARGV[0]" or die;
+open OUT, ">$ARGV[0].tmp" or die;
+
+while (<IN>) {
+    # !!! should use a real XML library here.
+    if (!/<dllmap dll="(.*)" target="(.*)"\/>/) {
+        print OUT;
+        next;
+    }
+    my $dll = $1;
+    my $target = $2;
+
+    foreach my $path (@paths) {
+        my $fullPath = "$path/lib/$target";
+        if (-e "$fullPath") {
+            $target = $fullPath;
+            last;
+        }
+    }
+
+    print OUT "  <dllmap dll=\"$dll\" target=\"$target\"/>\n";
+}
+
+close IN;
+
+rename "$ARGV[0].tmp", "$ARGV[0]" or die "cannot rename $ARGV[0]";