ports/69052: Maintainer-update switch workrave to new gtkmm

[Koop Mast]

> I don't have any problems with GCC 2 on 4.10. Should I drop the USE_GCC?
> BTW, I *think* (but am not sure) that dropping the suffix from LIB_DEPENDS
> should work as well and avoid chasing any bumps the libs make.
> 
> Volker

The suffix of 26 is there to use the libgnomeuimm 2.6.x (x11-
toolkits/libgnomeuimm26) and dependencies, instead of the old
libgnomeuimm 2.0.0 (x11-toolkits/libgnomeuimm). 

The gtkmm26 and gnomemm26 ports are compiled with g++ 3.3 which are not
compatible with the g++ code produced by gcc 2.95.x. The old gtkmm en
gnomemm ports can indeed be build with gcc 2.95,x.

Koop