[tools/depends][target] remove meson_cross_setup

[fuzzard]

Description

We moved the meson cross file setup to the configure script in 0ef3158. Just remove the remnants

Motivation and context

Just noticed as i had a minute.

How has this been tested?

Jenkins linux/android/apple builds run

What is the effect on users?

N/A

Screenshots (if appropriate):

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

Checklist:

• My code follows the Code Guidelines of this project
• My change requires a change to the documentation, either Doxygen or wiki
• I have updated the documentation accordingly
• I have read the Contributing document
• I have added tests to cover my change
• All new and existing tests passed

[lrusak]

Seems ok. I'm surprised this wasn't removed in the original PR.

[fuzzard]

Oversight and stupidity obviously 😉