CDRIVER-2474 update "make dist" for older cmake, 2
CDRIVER-2474 update "make dist" for older cmake, 2

Older CMake's file-copy command can't handle symlinks, so replace the
symlink from 7750279a.0 to ca.pem with an actual file.

rcsanchez97/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,jmikola/mongo-c-driver,acmorrow/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,jmikola/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,mongodb/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,ajdavis/mongo-c-driver,mongodb/mongo-c-driver,ajdavis/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,derickr/mongo-c-driver,jmikola/mongo-c-driver,derickr/mongo-c-driver,beingmeta/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,derickr/mongo-c-driver,acmorrow/mongo-c-driver,mongodb/mongo-c-driver,derickr/mongo-c-driver,acmorrow/mongo-c-driver,beingmeta/mongo-c-driver,jmikola/mongo-c-driver,mongodb/mongo-c-driver,jmikola/mongo-c-driver,rcsanchez97/mongo-c-driver,mongodb/mongo-c-driver,acmorrow/mongo-c-driver,ajdavis/mongo-c-driver,rcsanchez97/mongo-c-driver,beingmeta/mongo-c-driver,ajdavis/mongo-c-driver,jmikola/mongo-c-driver,jmikola/mongo-c-driver,beingmeta/mongo-c-driver,remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,remicollet/mongo-c-driver,rcsanchez97/mongo-c-driver,ajdavis/mongo-c-driver,beingmeta/mongo-c-driver,acmorrow/mongo-c-driver,remicollet/mongo-c-driver,remicollet/mongo-c-driver