Fix the build failure with OS_ANDROID (#4232)

Summary:
sysmacros.h should be included in OS_ANDROID build as well otherwise the compile would complain: error: use of undeclared identifier 'major'.
Fixes https://github.com/facebook/rocksdb/issues/4231
Pull Request resolved: https://github.com/facebook/rocksdb/pull/4232

Differential Revision: D9217350

Pulled By: maysamyabandeh

fbshipit-source-id: 21f4b62dbbda3163120ac0b38b95d95d35d67dce

env/env_posix.cc

@@ -20,7 +20,7 @@
 #include <sys/ioctl.h>
 #include <sys/mman.h>
 #include <sys/stat.h>
-#if defined(OS_LINUX) || defined(OS_SOLARIS)
+#if defined(OS_LINUX) || defined(OS_SOLARIS) || defined(OS_ANDROID)
 #include <sys/statfs.h>
 #include <sys/syscall.h>
 #include <sys/sysmacros.h>