[release/8.0-staging] Add support for more libicu versions

[NikolaMilosavljevic]

Fixes: #115274

Debian Trixie package repository was updated to include just libicu76. We require libicu72.

Besides version 76, this PR also adds versions 77 and 78, to limit the need to change this file often.

[Copilot]

Pull Request Overview

This PR adds support for additional ICU library versions to accommodate changes in the Debian Trixie package repository.

• Introduces ICU versions 78, 77, and 76 into the KnownLibIcuVersion list
• Extends the dependency matching to reduce future maintenance effort

[am11]

It would be nice to devise a more flexible scheme matching its native counterpart:

runtime/src/native/libs/System.Globalization.Native/pal_icushim.c

Lines 242 to 243 in 8d07196

	#define MinICUVersion 60
	#define MaxICUVersion (U_ICU_VERSION_MAJOR_NUM + 30)

Max version is relative to the libicu version available on build machine.

[NikolaMilosavljevic]

It would be nice to devise a more flexible scheme matching its native counterpart:

runtime/src/native/libs/System.Globalization.Native/pal_icushim.c

Lines 242 to 243 in 8d07196

	#define MinICUVersion 60
	#define MaxICUVersion (U_ICU_VERSION_MAJOR_NUM + 30)

Max version is relative to the libicu version available on build machine.

Yeah, it would be great to not touch this again. I'll create an issue to track the long-term fix.

[tarekgh]

78

If we already adding non -released versions, why can't add more version like 79, 80, 81, 81 ax example?

[am11]

I gave a similar suggestion above, @NikolaMilosavljevic will track it separately. I think there we could also revisit if we need the version guard any longer, and consider switching to feature detection.

[NikolaMilosavljevic]

Future improvement is now tracked in #115407

[NikolaMilosavljevic]

This was approved for servicing - updating the label.