[php-src] Issue #7978: sockets extension compilation errors

Issue: https://github.com/php/php-src/issues/7978 Comment Author: devnexen thanks `conftest.c:34:8: error: variable 'u' has initializer but incomplete type 34 | struct ucred u = {.gid = 0}; | ^~~~~ conftest.c:34:20: error: 'struct ucred' has no member named 'gid' 34 | struct ucred u = {.gid = 0}; | ^~~ conftest.c:34:26: warning: excess elements in struct initializer 34 | struct ucred u = {.gid = 0}; | ^ conftest.c:34:26: note: (near initialization for 'u') conftest.c:34:14: error: storage size of 'u' isn't known 34 | struct ucred u = {.gid = 0};` seems to be what I expected.