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

fusl/include/dlfcn.h

Index: fusl/include/dlfcn.h
diff --git a/fusl/include/dlfcn.h b/fusl/include/dlfcn.h
new file mode 100644
index 0000000000000000000000000000000000000000..78fb0733b2eb82be221e2e26fb5df369be7bb715
--- /dev/null
+++ b/fusl/include/dlfcn.h
@@ -0,0 +1,42 @@
+#ifndef	_DLFCN_H
+#define	_DLFCN_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <features.h>
+
+#define RTLD_LAZY   1
+#define RTLD_NOW    2
+#define RTLD_NOLOAD 4
+#define RTLD_NODELETE 4096
+#define RTLD_GLOBAL 256
+#define RTLD_LOCAL  0
+
+#define RTLD_NEXT    ((void *)-1)
+#define RTLD_DEFAULT ((void *)0)
+
+#define RTLD_DI_LINKMAP 2
+
+int    dlclose(void *);
+char  *dlerror(void);
+void  *dlopen(const char *, int);
+void  *dlsym(void *__restrict, const char *__restrict);
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+typedef struct {
+	const char *dli_fname;
+	void *dli_fbase;
+	const char *dli_sname;
+	void *dli_saddr;
+} Dl_info;
+int dladdr(const void *, Dl_info *);
+int dlinfo(void *, int, void *);
+#endif
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif