CI: Enable distcheck in CI
CI: Enable distcheck in CI

scan-build --status-bugs only returns its own, but not compiler
return codes. Otoh, without --status-bugs scanbuild's errors are
not return via exit code. Thus combining it with distcheck left
some errors undetected.
Separating out scan-build and distcheck to cover both.

Signed-off-by: Andreas Fuchs <622ac2c25087201462d23b927a044354eba8dded@sit.fraunhofer.de>

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