python3-grpcio: Add missing include for close/open APIs

This is found with clang16 stricter warnings

Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-grpcio/0001-zlib-Include-unistd.h-for-open-close-C-APIs.patch

@@ -0,0 +1,27 @@
+From 4432b9a296c9c287dfe281b4d464dfd03e4eb721 Mon Sep 17 00:00:00 2001
+From: Khem Raj <raj.khem@gmail.com>
+Date: Sun, 12 Feb 2023 21:25:04 -0800
+Subject: [PATCH] zlib: Include unistd.h for open/close C APIs
+
+Upstream-Status: Pending
+
+Signed-off-by: Khem Raj <raj.khem@gmail.com>
+---
+ third_party/zlib/gzguts.h | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/third_party/zlib/gzguts.h b/third_party/zlib/gzguts.h
+index 57faf37..3c700c2 100644
+--- a/third_party/zlib/gzguts.h
++++ b/third_party/zlib/gzguts.h
+@@ -19,6 +19,7 @@
+ #endif
+ 
+ #include <stdio.h>
++#include <unistd.h>
+ #include "zlib.h"
+ #ifdef STDC
+ #  include <string.h>
+-- 
+2.39.1
+