swtpm-localca: Re-implement variable resolution for swtpm-localca.conf

swtpm_localca v0.5 supported resolution of environment variables for
the swtpm-localca.conf configuration file. This functionality was lost
during the port to 'C' in v0.6. This patch now re-implements it.

Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
Resolves: https://github.com/stefanberger/swtpm/issues/663
1 file changed