Add a "fork" of musl as //fusl.

fusl/src/linux/fanotify.c

Index: fusl/src/linux/fanotify.c
diff --git a/fusl/src/linux/fanotify.c b/fusl/src/linux/fanotify.c
new file mode 100644
index 0000000000000000000000000000000000000000..c6211afc0002dbf1a288b6375d662cece5e35c5c
--- /dev/null
+++ b/fusl/src/linux/fanotify.c
@@ -0,0 +1,14 @@
+#include "syscall.h"
+#include <sys/fanotify.h>
+
+int fanotify_init(unsigned flags, unsigned event_f_flags)
+{
+	return syscall(SYS_fanotify_init, flags, event_f_flags);
+}
+
+int fanotify_mark(int fanotify_fd, unsigned flags, unsigned long long mask,
+	          int dfd, const char *pathname)
+{
+	return syscall(SYS_fanotify_mark, fanotify_fd, flags, __SYSCALL_LL_E(mask), dfd, pathname);
+}
+