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

fusl/src/time/__map_file.c

Index: fusl/src/time/__map_file.c
diff --git a/fusl/src/time/__map_file.c b/fusl/src/time/__map_file.c
new file mode 100644
index 0000000000000000000000000000000000000000..b91eb8edb986438c75152d737e6f4734b8e04fb1
--- /dev/null
+++ b/fusl/src/time/__map_file.c
@@ -0,0 +1,20 @@
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include "syscall.h"
+
+void *__mmap(void *, size_t, int, int, int, off_t);
+
+const char unsigned *__map_file(const char *pathname, size_t *size)
+{
+	struct stat st;
+	const unsigned char *map = MAP_FAILED;
+	int fd = __sys_open(pathname, O_RDONLY|O_CLOEXEC|O_NONBLOCK);
+	if (fd < 0) return 0;
+	if (!__syscall(SYS_fstat, fd, &st)) {
+		map = __mmap(0, st.st_size, PROT_READ, MAP_SHARED, fd, 0);
+		*size = st.st_size;
+	}
+	__syscall(SYS_close, fd);
+	return map == MAP_FAILED ? 0 : map;
+}