Musl: Add dladdr declaration in dlfcn

Author: Geod24

src/core/sys/posix/dlfcn.d

@@ -294,6 +294,15 @@ else version (CRuntime_Musl)
     const(char)* dlerror();
     void*        dlopen(const scope char*, int);
     void*        dlsym(void*, const scope char*);
+
+    int dladdr(scope const void *addr, Dl_info *info);
+    struct Dl_info
+    {
+        const(char)* dli_fname;
+        void*        dli_fbase;
+        const(char)* dli_sname;
+        void*        dli_saddr;
+    }
 }
 else version (CRuntime_UClibc)
 {