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

fusl/src/unistd/close.c

Index: fusl/src/unistd/close.c
diff --git a/fusl/src/unistd/close.c b/fusl/src/unistd/close.c
new file mode 100644
index 0000000000000000000000000000000000000000..fa3c6cab7e9813ad280329bfd7ebf45cb738c321
--- /dev/null
+++ b/fusl/src/unistd/close.c
@@ -0,0 +1,19 @@
+#include <unistd.h>
+#include <errno.h>
+#include "syscall.h"
+#include "libc.h"
+
+static int dummy(int fd)
+{
+	return fd;
+}
+
+weak_alias(dummy, __aio_close);
+
+int close(int fd)
+{
+	fd = __aio_close(fd);
+	int r = __syscall_cp(SYS_close, fd);
+	if (r == -EINTR) r = 0;
+	return __syscall_ret(r);
+}