configure.ac: minor cleanups
configure.ac: minor cleanups

Fix some minor mistakes made in the initial commit
01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools,01org/tpm2.0-tools,01org/tpm2.0-tools,martinezjavier/tpm2-tools,martinezjavier/tpm2-tools