v-build.pl 1.6.3 fails on mac os/x

[nawrockie]

v-build.pl NC_001474 test fails with:

ERROR in vdr_EutilsFetchToFile, problem fetching NC_001474 (undefined)

Even when computer is online.
This is similar to
#62
but the resolution for that issue was to connect to the internet. That doesn't solve this issue.

[nawrockie]

I tracked this down to an issue with Certificate Authorities and found a fix for at least my instance of the problem - requiring the Mozilla::CA module. This perl module was not installed on the mac/osx systems I encountered the problem with and after I installed it with cpan install Mozilla::CA the issue was resolved.

"Fixed" as of commit 2a047f2, which adds a use Mozilla::CA; line to v-build.pl and so alerts user that this module needs to be installed. That commit also adds a note about installing Mozilla::CA to the install documentation.