sonic-frr: Add patch to skip installing png files

In the build in Bullseye, there are no png files available in the
specified installation source directory. For now, don't bother
installing those files.

This may end up being reverted later if there are indeed png files that
need to be installed for documentation.

Signed-off-by: Saikrishna Arcot <sarcot@microsoft.com>

src/sonic-frr/patch/0010-remove-doc-png-install.patch

@@ -0,0 +1,21 @@
+Remove the *.png file installation from the frr-doc package. It doesn't look
+like it's installed there with Bullseye's tools.
+
+From: Saikrishna Arcot <sarcot@microsoft.com>
+
+---
+ debian/frr-doc.install |    1 -
+ 1 file changed, 1 deletion(-)
+
+diff --git a/debian/frr-doc.install b/debian/frr-doc.install
+index c48dc5a8d..955c8fc5a 100644
+--- a/debian/frr-doc.install
++++ b/debian/frr-doc.install
+@@ -3,7 +3,6 @@ usr/share/doc/frr/html
+ 
+ # info + images referenced by it
+ usr/share/info/
+-doc/user/_build/texinfo/*.png usr/share/info
+ 
+ # other
+ README.md         usr/share/doc/frr

src/sonic-frr/patch/series

@@ -7,3 +7,4 @@
 0008-Add-support-of-bgp-l3vni-evpn.patch
 0009-Add-bgp-bestpath-peer-type-multipath-relax.patch
 0009-Link-local-scope-was-not-set-while-binding-socket-for-bgp-ipv6-link-local-neighbors.patch
+0010-remove-doc-png-install.patch