Remove framework headers using RemoveHeadersOnCopy…
Remove framework headers using RemoveHeadersOnCopy…

…rather than a shell script which breaks the code signature.

This attribute is not documented and seemingly not exposed in the Xcode UI (but apparently gets set “sometimes”).

See also: http://openradar.me/19794988 and http://stackoverflow.com/questions/29275293.
nriley/Shroud,nriley/Shroud