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

fusl/src/conf/legacy.c

+#include <sys/sysinfo.h>
+#include <unistd.h>
+
+int get_nprocs_conf()
+{
+        return sysconf(_SC_NPROCESSORS_CONF);
+}
+
+int get_nprocs()
+{
+        return sysconf(_SC_NPROCESSORS_ONLN);
+}
+
+long get_phys_pages()
+{
+        return sysconf(_SC_PHYS_PAGES); 
+}
+
+long get_avphys_pages()
+{
+        return sysconf(_SC_AVPHYS_PAGES);       
+}