qt: monolithic or modular?

[Efraim Flashner]

I try very hard to not build qt on my laptop, mostly because of the long build 
time (7 hours on hydra [0]). Currently we download and use the big download of 
qt[1] and frankly I'd rather not. Qt does also ship in smaller bits[2], 32 if I 
counted correctly. I propose we package the submodules and over time we go 
through the packages that use qt and switch out the monolithic qt for just the 
parts that the program actually uses. It makes it less daunting to build, 
should make the closures smaller, and means that if a submodule fails to build 
on an architecture then they only lose that module, not all of qt.

[0] http://hydra.gnu.org/build/1114596
[1] 
https://download.qt.io/official_releases/qt/5.6/5.6.0/single/qt-everywhere-opensource-src-5.6.0.tar.xz
[2] https://download.qt.io/official_releases/qt/5.6/5.6.0/submodules/

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