[C] Replace strstr assertion with GMock starts with.
[C] Replace strstr assertion with GMock starts with.

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