tss2-tcti: add missing C++ compatibility in tss2_tctildr.h
tss2-tcti: add missing C++ compatibility in tss2_tctildr.h

Fixes: #1855
Signed-off-by: Diego Santa Cruz <1619b5e2459c78cdd7f079b89fd6104d5508710c@spinetix.com>

01org/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,tpm2-software/tpm2-tss,tpm2-software/tpm2-tss,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/TPM2.0-TSS,01org/tpm2-tss,01org/tpm2-tss