[lipo] add -remove flag (#188275)
Add the -remove flag to llvm-lipo. This matches the existing Darwin lipo
tool:
```
% xcrun lipo 2>&1 | grep remove
error: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/lipo: one of -create, -thin <arch_type>, -extract <arch_type>, -remove <arch_type>, -replace <arch_type> <file_name>, -verify_arch <arch_type> ... , -archs, -info, or -detailed_info must be specified
-remove <arch_type> [-remove <arch_type> ...]
```
Assisted-by: claude-code
