Merge "adb: use correct _WIN32 macro."

am: 5c75b529f6

* commit '5c75b529f684b388c91c7e7d0b2c7fece376ac1d':
  adb: use correct _WIN32 macro.

adb/commandline.cpp

@@ -439,7 +439,7 @@ static void* stdin_read_thread(void* x) {
 
     adb_thread_setname("stdin reader");
 
-#ifndef __WIN32
+#ifndef _WIN32
     // Mask SIGTTIN in case we're in a backgrounded process
     sigset_t sigset;
     sigemptyset(&sigset);