Suppress cast function type warnings where needed for bio

Change-Id: I3b2d7d0735c5b8e32c4fc04d0926e366b59d121b
Reviewed-on: https://boringssl-review.googlesource.com/c/boringssl/+/72067
Reviewed-by: Tom Flucke <tflucke@google.com>
Reviewed-by: David Benjamin <davidben@google.com>
Commit-Queue: David Benjamin <davidben@google.com>

crypto/bio/connect.c

diff --git a/crypto/bio/connect.c b/crypto/bio/connect.c
index 900e659..50d8983 100644
--- a/crypto/bio/connect.c
+++ b/crypto/bio/connect.c
@@ -487,7 +487,11 @@
       // convention.
       OPENSSL_MSVC_PRAGMA(warning(push))
       OPENSSL_MSVC_PRAGMA(warning(disable : 4191))
+      OPENSSL_CLANG_PRAGMA("clang diagnostic push")
+      OPENSSL_CLANG_PRAGMA("clang diagnostic ignored \"-Wunknown-warning-option\"")
+      OPENSSL_CLANG_PRAGMA("clang diagnostic ignored \"-Wcast-function-type\"")
       data->info_callback = (int (*)(const struct bio_st *, int, int))fp;
+      OPENSSL_CLANG_PRAGMA("clang diagnostic pop")
       OPENSSL_MSVC_PRAGMA(warning(pop))
       break;
     default: