dependencies: update protobuf to 3.8.0 (#7510)

In addition to updating protobuf to 3.8.0, this PR also

Removes old protobuf patch now included in 3.8.0
- Patches protocolbuffers/protobuf#6333 that fixes a UBSAN error in the protobuf library.
- Patches protobuf's BUILD to depend on foreign_cc zlib

Risk level: low/medium
Testing: bazel test //test/...

Signed-off-by: Asra Ali <asraa@google.com>

Mirrored from https://github.com/envoyproxy/envoy @ 8246167b9d238797cbc6c03dccc9e3921c37617d

tools/data/tap2pcap_h2_ipv4.txt

@@ -1,6 +1,6 @@
     1   0.000000    127.0.0.1 → 127.0.0.1    HTTP2 157 Magic, SETTINGS[0], WINDOW_UPDATE[0], HEADERS[1]: GET /
     2   0.013713    127.0.0.1 → 127.0.0.1    HTTP2 91 SETTINGS[0], SETTINGS[0], WINDOW_UPDATE[0]
-    3   0.013820    127.0.0.1 → 127.0.0.1    HTTP2 63 SETTINGS[0]
+    3   0.013821    127.0.0.1 → 127.0.0.1    HTTP2 63 SETTINGS[0]
     4   0.128649    127.0.0.1 → 127.0.0.1    HTTP2 5586 HEADERS[1]: 200 OK
-    5   0.130006    127.0.0.1 → 127.0.0.1    HTTP2 7573 DATA[1]
-    6   0.131044    127.0.0.1 → 127.0.0.1    HTTP2 3152 DATA[1], DATA[1] (text/html)
+    5   0.130007    127.0.0.1 → 127.0.0.1    HTTP2 7573 DATA[1]
+    6   0.131045    127.0.0.1 → 127.0.0.1    HTTP2 3152 DATA[1], DATA[1] (text/html)