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

fusl/include/link.h

+#ifndef _LINK_H
+#define _LINK_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <elf.h>
+#define __NEED_size_t
+#define __NEED_uint32_t
+#include <bits/alltypes.h>
+
+#if UINTPTR_MAX > 0xffffffff
+#define ElfW(type) Elf64_ ## type
+#else
+#define ElfW(type) Elf32_ ## type
+#endif
+
+/* this is the same everywhere except alpha and s390 */
+typedef uint32_t Elf_Symndx;
+
+struct dl_phdr_info {
+        ElfW(Addr) dlpi_addr;
+        const char *dlpi_name;
+        const ElfW(Phdr) *dlpi_phdr;
+        ElfW(Half) dlpi_phnum;
+        unsigned long long int dlpi_adds;
+        unsigned long long int dlpi_subs;
+        size_t dlpi_tls_modid;
+        void *dlpi_tls_data;
+};
+
+struct link_map {
+        ElfW(Addr) l_addr;
+        char *l_name;
+        ElfW(Dyn) *l_ld;
+        struct link_map *l_next, *l_prev;
+};
+
+struct r_debug {
+        int r_version;
+        struct link_map *r_map;
+        ElfW(Addr) r_brk;
+        enum { RT_CONSISTENT, RT_ADD, RT_DELETE } r_state;
+        ElfW(Addr) r_ldbase;
+};
+
+int dl_iterate_phdr(int (*)(struct dl_phdr_info *, size_t, void *), void *);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif