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

fusl/src/passwd/getspnam.c

Index: fusl/src/passwd/getspnam.c
diff --git a/fusl/src/passwd/getspnam.c b/fusl/src/passwd/getspnam.c
new file mode 100644
index 0000000000000000000000000000000000000000..041f896525f1e68f6fbf8076a3bb42a154f0752b
--- /dev/null
+++ b/fusl/src/passwd/getspnam.c
@@ -0,0 +1,17 @@
+#include "pwf.h"
+
+#define LINE_LIM 256
+
+struct spwd *getspnam(const char *name)
+{
+	static struct spwd sp;
+	static char *line;
+	struct spwd *res;
+	int e;
+
+	if (!line) line = malloc(LINE_LIM);
+	if (!line) return 0;
+	e = getspnam_r(name, &sp, line, LINE_LIM, &res);
+	if (e) errno = e;
+	return res;
+}