Fix Android recognition

The official macro is __ANDROID__; ANDROID may or may not be defined.

libraries/liblmdb/mdb.c

@@ -138,7 +138,7 @@ typedef SSIZE_T	ssize_t;
 #include <unistd.h>
 #endif
 
-#if defined(__sun) || defined(ANDROID)
+#if defined(__sun) || defined(__ANDROID__)
 /* Most platforms have posix_memalign, older may only have memalign */
 #define HAVE_MEMALIGN	1
 #include <malloc.h>
@@ -154,7 +154,7 @@ typedef SSIZE_T	ssize_t;
 # define MDB_USE_SYSV_SEM	1
 # endif
 # define MDB_FDATASYNC		fsync
-#elif defined(ANDROID)
+#elif defined(__ANDROID__)
 # define MDB_FDATASYNC		fsync
 #endif
 
@@ -300,7 +300,7 @@ union semun {
  */
 #ifndef MDB_USE_ROBUST
 /* Android currently lacks Robust Mutex support. So does glibc < 2.4. */
-# if defined(MDB_USE_POSIX_MUTEX) && (defined(ANDROID) || \
+# if defined(MDB_USE_POSIX_MUTEX) && (defined(__ANDROID__) || \
 	(defined(__GLIBC__) && GLIBC_VER < 0x020004))
 #  define MDB_USE_ROBUST	0
 # else