[c-libraries] use current date as Version
[c-libraries] use current date as Version

in case the real pkg-config is pkg-config
the alternate pkgconfig does not require this option

Signed-off-by: Christopher Hall <97c3bc3fef1a71b149f1095f758464e4b18eb35b@bitmark.com>

bitmark-inc/bitmarkd,bitmark-inc/bitmarkd