cmake: Install libsecp256k1.pc file #1422

1. 
   hebasto commented at 8:01 pm on September 7, 2023: member

   This PR allows downstream projects to use pkg-config to search for the libsecp256k1 library that is built with CMake.

   Addressed https://github.com/bitcoin-core/secp256k1/discussions/1419#discussioncomment-6922896:

   We could just ship the pkg-config file also in CMake builds.

2. cmake: Install `libsecp256k1.pc` file

   This change allows downstream projects to use pkg-config to search for
   the libsecp256k1 library that is built with CMake.

   9f005c60d6
3. ci: Align Autotools/CMake `CI_INSTALL` directory names 421d84855a
4. real-or-random added the label build on Sep 8, 2023
5. real-or-random added the label needs-changelog on Sep 8, 2023
6. real-or-random approved
7. 
   real-or-random commented at 12:56 pm on September 8, 2023: contributor

   ACK https://github.com/bitcoin-core/secp256k1/pull/1422/commits/421d84855aeb9324b4f131c3e6c7ee8cf4f5f4e5 I compared the generated pc files and they match in autotools and CMake

   (Well, they match except for the -dev suffix we have in autotools on non-release commits… but there’s not really support for this in CMake, so it seems we have to live with this for now. https://gitlab.kitware.com/cmake/cmake/-/issues/16716 )

8. real-or-random merged this on Sep 12, 2023
9. real-or-random closed this on Sep 12, 2023

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10. hebasto deleted the branch on Sep 12, 2023

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hebasto real-or-random

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