llvm-6.0: Whitespace

[Dave-Allured]

Description

• Whitespace only. Change tabs to spaces.
• Fix port lint.

Type(s)

Tested on

Lint check only.

Verification

Have you

• followed our Commit Message Guidelines?
• squashed and minimized your commits?
• checked that there aren't other open pull requests for the same change?
• checked your Portfile with port lint?
• tried existing tests with sudo port test?
• tried a full install with sudo port -vst install?
• tested basic functionality of all binary files?
• checked that the Portfile's most important variants haven't been broken?

[macportsbot]

Notifying maintainers:
@jeremyhu for port llvm-6.0.