ci: fix failing vlib/v/tests/option_test.c.v

vlib/os/os_structs_stat_windows.c.v

@@ -1,5 +1,21 @@
 module os
 
+// Minimal stat struct as specified in
+// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_stat.h.html
+pub struct C.stat {
+	st_dev   u64
+	st_ino   u64
+	st_mode  u32
+	st_nlink u64
+	st_uid   u32
+	st_gid   u32
+	st_rdev  u64
+	st_size  u64
+	st_atime int
+	st_mtime int
+	st_ctime int
+}
+
 pub struct C.__stat64 {
 	st_dev   u32 // 4
 	st_ino   u16 // 2