Add SYMROOT for xcodebuild in case the Xcode defaults
PBXApplicationwideBuildSettings specify a custom build location
Signed-off-by: Adam Vandenberg <flangy@gmail.com>
Formula for Platypus version 4.2.
Note: This builds only the command-line utility, not the application
bundle, as homebrew is not supposed to build apps.
Signed-off-by: Adam Vandenberg <flangy@gmail.com>