mariabackup requires libcrc.so

Hi,

I'm keeping my own backports from rawhide and essentially bump the version when needed.

This time there is a problem when building extra/mariabackup because you cannot install the built RPM packages due to missing deps.

$ rpm -qp --requires mariadb-10.1.23-0.1.el7.centos.x86_64.rpm | grep crc

libcrc.so()(64bit)

When I extract the mariabackup binary I see:

$ ldd mariabackup | grep crc

        libcrc.so => not found

I suspect some cmake voodoo magic is required to build libcrc (extra/mariabackup/crc) statically and not exporting any symbols.

Cheers.