[build2] pkgconfig files, header-only libraries, and cppget's boost packages

[Michael Martín Moro]

Hi !

I've seen something that puzzled me while trying to import libboost
packages.

They use `import intf_libs` or `import impl_libs` for importing all boost
dependencies... including header only ones.

Seems to me like it resuls in pkgconfig files including a lot of extra
library to link that do not exist. You can check it out with
libboost-program-options or libboost-random: there are some -lboost_any
here and -lboost_config there that shouldn't be there.

It is my understanding that those header-only libraries should be imported
using `import libs` instead. At least that's what has worked with me so far.

I'm left wondering if there's something I'm doing wrong, or if there's a
problem with those boost buildfiles ?

-- 
*Michaël Martín Moro*
{ Epitech. Tek4 }
{ UCA Cadíz - Computer Engineering }
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