Check alpha-sorting of includes during presubmit.

src/platform-posix.cc

Index: src/platform-posix.cc
diff --git a/src/platform-posix.cc b/src/platform-posix.cc
index 87b96e2aae77de139d934fa7d6b7490980439ce3..36cb8eb22cf2dc20ec291fc3f9d58230bfba43bc 100644
--- a/src/platform-posix.cc
+++ b/src/platform-posix.cc
@@ -7,37 +7,38 @@
 // Linux, MacOS, FreeBSD, OpenBSD, NetBSD and QNX.
 
 #include <dlfcn.h>
+#include <errno.h>
 #include <pthread.h>
 #if defined(__DragonFly__) || defined(__FreeBSD__) || defined(__OpenBSD__)
 #include <pthread_np.h>  // for pthread_set_name_np
 #endif
 #include <sched.h>  // for sched_yield
-#include <unistd.h>
-#include <errno.h>
 #include <time.h>
+#include <unistd.h>
 
 #include <sys/mman.h>
 #include <sys/resource.h>
+#include <sys/stat.h>
 #include <sys/time.h>
 #include <sys/types.h>
-#include <sys/stat.h>
+
 #if defined(__linux__)
-#include <sys/prctl.h>  // for prctl
+#include <sys/prctl.h>  // NOLINT, for prctl
 #endif
 #if defined(__APPLE__) || defined(__DragonFly__) || defined(__FreeBSD__) || \
     defined(__NetBSD__) || defined(__OpenBSD__)
-#include <sys/sysctl.h>  // for sysctl
+#include <sys/sysctl.h>  // NOLINT, for sysctl
 #endif
 
 #include <arpa/inet.h>
-#include <netinet/in.h>
 #include <netdb.h>
+#include <netinet/in.h>
 
 #undef MAP_TYPE
 
 #if defined(ANDROID) && !defined(V8_ANDROID_LOG_STDOUT)
 #define LOG_TAG "v8"
-#include <android/log.h>
+#include <android/log.h>  // NOLINT
 #endif
 
 #include "src/v8.h"