missing: move sys_execveat() to missing.h

The missing.h header provides syscalls potentially missing from the used
libc. Move the sys_execveat() definition into it. It doesn't belong into
vfstest.c.

Acked-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Zorro Lang <zlang@kernel.org>
2 files changed