Make dependencies in KStars

[Hy Murveit]

*TL;DR* KStars makefiles seem to recompile everything (or a lot anyway)
when seemingly small 'git pulls' come in. Wondering if there's something
wrong with the setup. I'm not a cmake wizard.

*Background:* I compile/test KStars mostly on my MacbookPro, and I find the
compile times very reasonable there. However, when I am ready to test
something with a telescope, I compile and run on my 4Gb RPi4. There it
takes about 40 minutes for me to completely build the system (I run 'make
-j6 kstars' and am compiling RelWithDebInfo) and for some reason, it often
seems to build most of the system.

*Gripe: *When I change a single .cpp in an Ekos module, yes, it seems to
work fine, just recompile that file, then build the library, then build the
binary. However, often I seem relatively small updates come in, and I
notice very long compiles.  Do others notice this? I wish I could give
concrete examples. Does anyone know how to analyze? E.g. is there a command
to see what would be compiled (and why) before running the make? Is there a
way to improve this?

Thanks,
Hy
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