This code was including the qmacdefines_mac.h header from QtWidgets,
which has recently been removed. Using the header is no longer
necessary.
Note that the qmacdefines_mac.h contained a workaround for some mac
system headers declaring variables named `slots'. Replace that
workaround with the standard no_keywords method.
Change-Id: Icd47a562d64953692e50a9fea8bb4a9c8424375c
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>