Let system-installed fast_float be found

[DarthGandalf]

Description

The library installs /usr/share/cmake/FastFloat/FastFloatConfig.cmake, so find_package(fast_float) cannot find it - find_package(FastFloat) can.

Only the CPMFindPackage line is relevant here, the other 2 are just for consistency, can revert them

Fixes # (issue)

Screenshots (if appropriate):

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update
• Housekeeping

How Has This Been Tested?

By checking build log with libc++

Test Configuration:

• Operating system: Gentoo
• Graphics Card: n/a

Checklist:

• My code follows the code style of this project.
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation (header file)
• I have updated the respective chapter in the Stellarium User Guide
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules

[alex-w]

Some reimplementation of #3828?

[DarthGandalf]

Ah, I haven't checked existing PRs

[alex-w]

Well, I see combined both PR looks like a complete patch.

[alex-w]

At least your patch is better, so, I reopened the PR

[DarthGandalf]

At least your patch is better

Not sure how it's better, but ok...

[10110111]

At least your patch is better, so, I reopened the PR

Well the variable name is insignificant, since it's our own variable, but I'm OK with any of these patches.

[10110111]

I guess this one is better for consistency of naming.

[github-actions]

Hello @DarthGandalf!

Please check the fresh version (development snapshot) of Stellarium:
https://github.com/Stellarium/stellarium-data/releases/tag/weekly-snapshot

[github-actions]

Hello @DarthGandalf!

Please check the latest stable version of Stellarium:
https://github.com/Stellarium/stellarium/releases/latest