pgpointcloud: remove icu dependency, fix '--without-cunit' flag

[nilason]

Description

Remove icu dependency for pgpointcloud. While pgpointcloud does indeed links to icu, it does so via xml2-config (of port libxml2). icu is not a direct dependency to pgpointcloud.

Closes https://trac.macports.org/ticket/68704

Unrelated fix for honoring --without-cunit flag is addressed upstreams: pgpointcloud/pointcloud#349

Type(s)

• bugfix
• enhancement
• security fix

Tested on

macOS 13.6.2 22G320 arm64
Xcode 15.0.1 15A507

Verification

Have you

• followed our Commit Message Guidelines?
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• checked that there aren't other open pull requests for the same change?
• referenced existing tickets on Trac with full URL?
• 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?

[ryandesign]

What about the other libxml2 dependencies that had been pulled in by xml2-config --libs—libiconv, xz, zlib? Does pointcloud use them directly—does it still link to them after this change? If not, they should be removed too.

[nilason]

What about the other libxml2 dependencies that had been pulled in by xml2-config --libs—libiconv, xz, zlib? Does pointcloud use them directly—does it still link to them after this change? If not, they should be removed too.

Good point! lzma and libiconv are not needed now either. Fixed.