Try to bring some consistency to ports that have x86-specific pieces.

• in general, if we think that the code is not architecture-specific, and instead just enables x86 assembler by default, those should use BROKEN rather than IGNORE. This will allow them to be attempted with TRYBROKEN.
• spell i386 as x86.
• spell asm as assembler.
• pet portlint.

These changes should have no effect on tier-1 builds.

Approved by: portmgr (tier-2 blanket)