bug#71146: [PATCH] gnu: kallisto: Update to 0.50.1

[Ricardo Wurmus]

Hi,

I'm back to work now and just reviewed our discussion on kallisto. 
We
may want to revisit the decision to not unbundle libbifrost and 
htslib
at a later point, but at the moment I agree to keep the bundled
libraries until we've attained more clarity.

I removed the now obsolete build phase completely and I disabled
parallel building (see comment).

Thanks for the patch and my apologies for not being able to merge 
this
sooner!

--
Ricardo