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

fusl/src/unistd/gethostname.c

Index: fusl/src/unistd/gethostname.c
diff --git a/fusl/src/unistd/gethostname.c b/fusl/src/unistd/gethostname.c
new file mode 100644
index 0000000000000000000000000000000000000000..f984b7dd2f9a88dde7fb23132424f912c17bcdc0
--- /dev/null
+++ b/fusl/src/unistd/gethostname.c
@@ -0,0 +1,13 @@
+#include <unistd.h>
+#include <sys/utsname.h>
+
+int gethostname(char *name, size_t len)
+{
+	size_t i;
+	struct utsname uts;
+	if (uname(&uts)) return -1;
+	if (len > sizeof uts.nodename) len = sizeof uts.nodename;
+	for (i=0; i<len && (name[i] = uts.nodename[i]); i++);
+	if (i==len) name[i-1] = 0;
+	return 0;
+}