Delete socket_forward_proxy

This only works with the vsoc driver.

Bug: 144111429
Test: Run with -vm_manager=qemu_cli
Change-Id: Ib67a3eb7d32426e16ae2ab337fd652ef039dc9b3
diff --git a/host_package.mk b/host_package.mk
index 5aa22ab..b9ea264 100644
--- a/host_package.mk
+++ b/host_package.mk
@@ -22,7 +22,6 @@
     launch_cvd \
     lpmake \
     lpunpack \
-    socket_forward_proxy \
     socket_vsock_proxy \
     adb_connector \
     stop_cvd \