Bug#1035822: fontforge: Superfluous build dependency on potrace

["David (Plasma) Paul" <davidpaul@librem.one>]

Source: fontforge
Version: 1:20201107~dfsg-1
Severity: minor

Dear Maintainer,

Please drop the build dependency on potrace from fontforge.

Prior to upstream fontforge's transition from Autotools to CMake in
version 20200314 [1], the Autoconf configure script contained a
compile-time check for potrace; however, AFAICT this was never anything
more than WIP code and nothing was ever done with the results of this
check. Starting with switch to a CMake buildsystem the compile-time
check for potrace is completely gone.

[1] https://github.com/fontforge/fontforge/releases/tag/20200314

-- 
Plasma