chai: do not install conflicting headers, revbump

[barracuda156]

Description

Well, this is needed, but is gonna be stopped by a broken MPICH until this is somehow resolved: #23395
Draft until then.

(What we address here is that chai now installs a copy of libfmt headers into the prefix, which a) we simply do not need and b) that may break some ports if they opportunistically use those headers.)

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 10.6
Xcode 3.2

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?
• referenced existing tickets on Trac with full URL in commit message?
• checked your Portfile with port lint --nitpick?
• 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?

[barracuda156]

Will reopen it later with updates to newer versions once this bug is addressed: LLNL/CHAI#265