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

fusl/src/temp/mktemp.c

Index: fusl/src/temp/mktemp.c
diff --git a/fusl/src/temp/mktemp.c b/fusl/src/temp/mktemp.c
new file mode 100644
index 0000000000000000000000000000000000000000..4ab0df2069ac6d0c685ea2265f15d40596392217
--- /dev/null
+++ b/fusl/src/temp/mktemp.c
@@ -0,0 +1,32 @@
+#define _GNU_SOURCE
+#include <string.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+char *__randname(char *);
+
+char *mktemp(char *template)
+{
+	size_t l = strlen(template);
+	int retries = 100;
+	struct stat st;
+
+	if (l < 6 || memcmp(template+l-6, "XXXXXX", 6)) {
+		errno = EINVAL;
+		*template = 0;
+		return template;
+	}
+
+	do {
+		__randname(template+l-6);
+		if (stat(template, &st)) {
+			if (errno != ENOENT) *template = 0;
+			return template;
+		}
+	} while (--retries);
+
+	*template = 0;
+	errno = EEXIST;
+	return template;
+}