argument: Fix cppcoreguidelines-avoid-c-arrays

Suppress it, as switching to std::array<...> causes g++ to complain that
options has an incomplete type.

```
../argument.hpp:44:25: error: do not declare C-style arrays, use std::array<> instead [cppcoreguidelines-avoid-c-arrays,-warnings-as-errors]
    static inline const option options[] = {
                        ^
```

Change-Id: I6730bd7fce25eac3fbf23ea083928b8a98bafa35
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/argument.hpp b/argument.hpp
index 332ecce..3dd2b9e 100644
--- a/argument.hpp
+++ b/argument.hpp
@@ -41,6 +41,7 @@
     std::map<const std::string, std::string> arguments;
 
     /** @brief Array of struct options as needed by getopt_long */
+    // NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays)
     static inline const option options[] = {
         {"path", required_argument, nullptr, 'p'},
         {"help", no_argument, nullptr, 'h'},