Fix build on mac.

On mac require a case.
Also, this code is not portable, will fix it in long run.

(cherry-pick of 0f1fda9ee80ba086e4c8960a7d153798e3cf3285.)

Change-Id: I76194b62cea29bd3d21c7ba6c3da4d549bea4738

adb/sysdeps.h

@@ -524,7 +524,7 @@ static __inline__ char*  adb_strtok_r(char *str, const char *delim, char **savep
 
 static __inline__ unsigned long adb_thread_id()
 {
-    return pthread_self();
+    return (unsigned long)pthread_self();
 }
 
 #undef   strtok_r