removes xcodebuild script
removes xcodebuild script

Travis-CI fails with a new error:

```
xcodebuild: error: Unknown build action '[DEFAULT_OPTIONS]'.
The command "xcodebuild [DEFAULT_OPTIONS] CODE_SIGNING_REQUIRED=NO"
exited with 65.
```

C4Labs/C4iOS,C4Framework/C4iOS,C4Labs/C4iOS,C4Framework/C4iOS