Switch GNU IceCat to follow upstream candidates

Considering Mozilla publishes the RC build(s) the week before the
release, following upstream candidate builds rather than waiting for
final releases gives us (and distros packaging IceCat downstream)
an additional week to prepare IceCat builds and do some testing
before Mozilla formally announces the release and any security
vulnerabilities discovered since the last release.

* makeicecat (FFBUILD): Add variable for the candidate build number.
(SOURCEBALL_URL): Update to point to candidate sourceballs instead.
(ICECATVERSION): Incorporate FFBUILD in GNU IceCat's version.

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