memmem is only being used in testing so move it there #1704

Job	Run time
Build UML (UserMode Linux)	3s
Build wolfSSL (hostap-vm-build1, --disable-tls13)	1m 43s
Build wolfSSL (hostap-vm-build2, --enable-wpas-dpp --enable-brainpool --with-eccminsz=192 --enabl...	2m 20s
hwsim test (true, true, hostap_2_10, true, hostap-vm-build1)	2m 27s
hwsim test (true, true, 07c9f183ea744ac04585fb6dd10220c75a5e2e74, e1876fbbf298ee442bc7ab8561331eb...	7m 52s
hwsim test (true, false, hostap_2_10, true, hostap-vm-build1)	2m 23s
hwsim test (true, false, 07c9f183ea744ac04585fb6dd10220c75a5e2e74, e1876fbbf298ee442bc7ab8561331e...	7m 54s
hwsim test (false, true, hostap_2_10, true, hostap-vm-build1)	2m 57s
hwsim test (false, true, b607d2723e927a3446d89aed813f1aa6068186bb, ad5b52a49b3cc2a5bfb47ccc1d6a51...	4m 33s
hwsim test (false, true, 07c9f183ea744ac04585fb6dd10220c75a5e2e74, e1876fbbf298ee442bc7ab8561331e...	8m 44s
	40m 56s

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