LibC: Implement support for getspnam() and friends

Author: https://github.com/gunnarbeutner
Commit: 302f9798ee
Pull-request: https://github.com/SerenityOS/serenity/pull/6777
Reviewed-by: https://github.com/awesomekling

Userland/Utilities/passwd.cpp

@@ -64,7 +64,7 @@ int main(int argc, char** argv)
 
     setpwent();
 
-    if (pledge("stdio wpath cpath fattr tty", nullptr) < 0) {
+    if (pledge("stdio wpath rpath cpath fattr tty", nullptr) < 0) {
         perror("pledge");
         return 1;
     }
@@ -93,7 +93,7 @@ int main(int argc, char** argv)
         target_account.set_password(new_password.value().characters());
     }
 
-    if (pledge("stdio wpath cpath fattr", nullptr) < 0) {
+    if (pledge("stdio wpath rpath cpath fattr", nullptr) < 0) {
         perror("pledge");
         return 1;
     }