audcore: Don't include linux/stat.h

On glibc, this is redundant (`sys/stat.h` includes `bits/statx.h`
includes `linux/stat.h`). On musl, it results in an error that `struct
statx` and `struct statx_timestamp` are being redefined. `sys/stat.h` is
the proper interface to use when using `statx` on Linux.

Author: classabbyamp

src/libaudcore/vfs_local.cc

@@ -446,7 +446,6 @@ bool LocalTransport::get_file_timestamps(const char * filename, int64_t * mtime,
 #include <sys/stat.h>
 #include <sys/types.h>
 
-#include <linux/stat.h>
 #include <sys/syscall.h>
 #include <unistd.h>