serf: Delete env config file

net-libs/serf package has been removed from Chrome OS for a while.
Remove the leftover env config file.

BUG=None
TEST=CQ

Change-Id: I61637f8195289475e97f5a726b6975c3ff7d2dca
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/chromiumos-overlay/+/2596231
Reviewed-by: Jack Rosenthal <jrosenth@chromium.org>
Commit-Queue: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed