pkg-config support

[Dima Pasechnik <dima@pasechnik.info>]

Hello,

in https://pari.math.u-bordeaux.fr/archives/pari-dev-2509/msg00000.html
it has been said in particular

> 4. pkg-config file
> Would you consider adding a `pkg-config` file for Pari? At the moment,
> users have to manually guess which additional libraries (`gmp`,
> `readline`, etc.) need to be linked. A pkg-config file would also make
> it much easier to discover Pari when it’s installed in non-standard
> locations.

while other items in that message were addressed
(https://pari.math.u-bordeaux.fr/archives/pari-dev-2509/msg00001.html), this one was not.
I have spent lately time fighting build systems unwilling to find
pari-gp in nonstandard locations, due to lack of said support.
Having such support, which is nowadays
standard across the NT landscape (gmp, mpfr, ntl, flint, primecount, etc have it)
is very desirable.
Would you consider merging such support, if developed?
(it's trivial with standard build systems like autotools or cmake, less
so in roll your own systems, but OK...)

Best
Dima

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