Update libaccessom2.pc.in

[dougiesquire]

In order to successfully link libaccessom2 with pkg-config I had to list the datetime-fortran dependency under Requires, not Requires.private, in libaccessom2.pc. I can't say I understand why, but this seems to fix issues I was having with linking.

Also, with this PR we now set libdir from CMAKE_INSTALL_LIBDIR.

Also also, should OASIS packages be included in the Requires section? Things work for me without them included, but in my application I am also explicitly linking OASIS.

[harshula]

https://people.freedesktop.org/~dbn/pkg-config-guide.html explains Requires.private.

[dougiesquire]

Yeah, I read that, but I don't think I understand why datetime-fortran needs to be exposed to applications in this case... Anyway I'll leave it up to you whether you're happy with this change.

[dougiesquire]

(Also, looks like someone needs to set up some branch protection rulesets on this repo)

[harshula]

Hi @CodeGat ☝️

[CodeGat]

Branch protections updated :)

[dougiesquire]

@harshula would you be able to review?

[harshula]

Hi @dougiesquire , I need to work out why Requires.private did not work and what we do in the futre. I should be able to get to it early next week.