Add support for MSG_NOSIGNAL in gRPC platform

This change updates the gRPC patch file to indicate support for
MSG_NOSIGNAL in the Asylo platform.

PiperOrigin-RevId: 281818011
Change-Id: I72504e0f8742b259d800c048b33317620451ff36

Author: annasapek

asylo/distrib/grpc_1_25_0.patch

@@ -1,10 +1,11 @@
 diff -Naur -x '*~' -x '*.orig' include/grpc/impl/codegen/port_platform.h include/grpc/impl/codegen/port_platform.h
 --- include/grpc/impl/codegen/port_platform.h
 +++ include/grpc/impl/codegen/port_platform.h
-@@ -198,6 +198,8 @@
+@@ -198,6 +198,9 @@
  #define GPR_POSIX_TIME 1
  #define GPR_POSIX_ENV 1
  #define GPR_ASYLO 1
++#define GRPC_HAVE_MSG_NOSIGNAL 1
 +#define GRPC_HAVE_UNIX_SOCKET 1
 +#define GRPC_IF_NAMETOINDEX 0
  #define GRPC_POSIX_SOCKET 1