Do not suggest patching Ultrix in README.md. [skip ci]

See commit 1fc034d and tcpdump-htdocs commit e7b1676.

(cherry picked from commit 61869ed2aab87cd010d58628ed79f7993734dfec)

diff --git a/README.md b/README.md
index 5427d7e703844e4ee5eb15e2504a0ccc44ca67d6..46c33c24125e35ecc69f664ca09dd92b510f5595 100644 (file)
--- a/README.md
+++ b/README.md
@@ -55,9 +55,7 @@ BPF is standard in 4.4BSD, BSD/OS, NetBSD, FreeBSD, OpenBSD, DragonFly
 BSD, macOS, and Solaris 11; an older, modified and undocumented version
 is standard in AIX.  {DEC OSF/1, Digital UNIX, Tru64 UNIX} uses the
 packetfilter interface but has been extended to accept BPF filters
-(which libpcap utilizes).  Also, you can add BPF filter support to
-Ultrix using the kernel source and/or object patches available
-[here](https://www.tcpdump.org/other/bpfext42.tar.Z).
+(which libpcap utilizes).
 
 Linux has a number of BPF based systems, and libpcap does not support
 any of the eBPF mechanisms as yet, although it supports many of the