Remove the redundant target platform

[rubo]

Changes

Removed the redundant $TARGETPLATFORM to silence the RedundantTargetPlatform warning.

Types of changes

What types of changes does your code introduce?

• [ ] Bugfix (a non-breaking change that fixes an issue)
• [ ] New feature (a non-breaking change that adds functionality)
• [ ] Breaking change (a change that causes existing functionality not to work as expected)
• [ ] Optimization
• [ ] Refactoring
• [ ] Documentation update
• [x] Build-related changes
• [ ] Other: Description

Testing

Requires testing

• [ ] Yes
• [x] No