Bug#839435: nsscache must build-depend on tzdata

[Adrian Bunk]

Control: retitle -1 nsscache must build-depend on tzdata

I have confirmed that the build fails without tzdata installed and 
succeeds with tzdata installed.

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed