Ports: Update ninja's patches to use git patches

Ports/ninja/patches/0003-Include-unistd.h-for-stat.patch

@@ -0,0 +1,24 @@
+From e692da2de8cbe09141e080499e0d7627d1b69b24 Mon Sep 17 00:00:00 2001
+From: Nico Weber <thakis@chromium.org>
+Date: Sun, 21 Jun 2020 18:41:01 -0400
+Subject: [PATCH 3/3] Include unistd.h for stat()
+
+---
+ src/disk_interface.cc | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/src/disk_interface.cc b/src/disk_interface.cc
+index 49af001..cb1fad5 100644
+--- a/src/disk_interface.cc
++++ b/src/disk_interface.cc
+@@ -21,6 +21,7 @@
+ #include <string.h>
+ #include <sys/stat.h>
+ #include <sys/types.h>
++#include <unistd.h>
+ 
+ #ifdef _WIN32
+ #include <sstream>
+-- 
+2.36.1
+