abis/linux: Define __MLIBC_O_ASYNC
#define __MLIBC_O_LARGEFILE 0100000
#define __MLIBC_O_NOATIME 01000000
#define __MLIBC_O_TMPFILE 020000000
+#define __MLIBC_O_ASYNC 020000
#define __MLIBC_O_EXEC __MLIBC_LINUX_O_PATH
#define __MLIBC_O_SEARCH __MLIBC_LINUX_O_PATH
