Create default-dns.patch from jammy patch

SOURCES/default-dns.patch

@@ -0,0 +1,26 @@
+From: Jason Rhinelander <jason@imaginary.ca>
+Date: Wed, 18 May 2022 12:47:59 -0300
+Subject: Change default DNS to 127.0.0.1:953
+
+This is a needed workaround for a systemd resolved bug 23010, until
+0.9.10 comes out (which will have a better fix to listen on both
+127.3.2.1 + 127.0.0.1:random-high-port).
+---
+ llarp/config/config.cpp | 4 +++-
+ 1 file changed, 3 insertions(+), 1 deletion(-)
+
+diff --git a/llarp/config/config.cpp b/llarp/config/config.cpp
+index 6bff961..a01f560 100644
+--- a/llarp/config/config.cpp
++++ b/llarp/config/config.cpp
+@@ -760,7 +760,9 @@ namespace llarp
+     // can bind to other 127.* IPs to avoid conflicting with something else that may be listening on
+     // 127.0.0.1:53.
+ #ifdef __linux__
+-    constexpr Default DefaultDNSBind{"127.3.2.1:53"};
++    // Workaround for systemd bug #23010 that breaks 127.0.0.0/8 resolvers on anything other than
++    // 127.0.0.1.  (This is temporary, until lokinet PR #1888 is merged in 0.9.10).
++    constexpr Default DefaultDNSBind{"127.0.0.1:953"};
+ #else
+     constexpr Default DefaultDNSBind{"127.0.0.1:53"};
+ #endif