[C] Fix strutil_test on Windows in Debug mode
[C] Fix strutil_test on Windows in Debug mode

strdup and free need to be called from the same binary
in order to ensure the same heap is used on malloc and free.

mikeb01/Aeron,real-logic/Aeron,mikeb01/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,EvilMcJerkface/Aeron,mikeb01/Aeron,mikeb01/Aeron,real-logic/Aeron,real-logic/Aeron,real-logic/Aeron,EvilMcJerkface/Aeron