use of undeclared identifier 'strdup'

[rvangraan]

When I try to compile any of the swift-matter examples, I run into the following error that I have no idea how to resolve.

Any suggestions? This is using the current HEAD version of this repo targeting esp32c6.

/Users/U/esp/esp-matter/components/esp_matter/esp_matter_client.h:57:26: error: use of undeclared identifier 'strdup'
 55 |     {
 56 |         if (json_str) {
 57 |             m_json_str = strdup(json_str);
    |                          `- error: use of undeclared identifier 'strdup'
 58 |         } else {
 59 |             if (usage == k_invoke_cmd) {

[kubamracek]

Resolved via #32