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

fusl/src/legacy/getloadavg.c

Index: fusl/src/legacy/getloadavg.c
diff --git a/fusl/src/legacy/getloadavg.c b/fusl/src/legacy/getloadavg.c
new file mode 100644
index 0000000000000000000000000000000000000000..ff06de0f8d1655a38abf95202c8550736404c88b
--- /dev/null
+++ b/fusl/src/legacy/getloadavg.c
@@ -0,0 +1,14 @@
+#define _GNU_SOURCE
+#include <stdlib.h>
+#include <sys/sysinfo.h>
+
+int getloadavg(double *a, int n)
+{
+	struct sysinfo si;
+	if (n <= 0) return n ? -1 : 0;
+	sysinfo(&si);
+	if (n > 3) n = 3;
+	for (int i=0; i<n; i++)
+		a[i] = 1.0/(1<<SI_LOAD_SHIFT) * si.loads[i];
+	return n;
+}