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

fusl/src/unistd/symlink.c

Index: fusl/src/unistd/symlink.c
diff --git a/fusl/src/unistd/symlink.c b/fusl/src/unistd/symlink.c
new file mode 100644
index 0000000000000000000000000000000000000000..0973d78a8936bca2cef633f361abd2401bd82f4a
--- /dev/null
+++ b/fusl/src/unistd/symlink.c
@@ -0,0 +1,12 @@
+#include <unistd.h>
+#include <fcntl.h>
+#include "syscall.h"
+
+int symlink(const char *existing, const char *new)
+{
+#ifdef SYS_symlink
+	return syscall(SYS_symlink, existing, new);
+#else
+	return syscall(SYS_symlinkat, existing, AT_FDCWD, new);
+#endif
+}