illumos gate

We ship /etc/mailcap in SUNWcs. There are several problems with this.

1. It contains only a line for Java Web Start and 51 lines for staroffice.
2. It is missing many useful mailcap lines.
3. SUNWcs shouldn't exist and removing this file would help with this goal.

Some possible ways to solve it include:

1. illumos-gate stops delivering /etc/mailcap, making it a distribution problem.
2. Instead of delivering /etc/mailcap directly, we deliver /etc/mailcap.d and a tool (SMF service?) to assemble /etc/mailcap from fragments in /etc/mailcap.d. This would allow packages to deliver mailcap entries.