0dd16d7118 build: Add a pkg-config file for libbitcoinkernel (TheCharlatan)
45be32f838 build: Produce a usable static kernel library (TheCharlatan)
Pull request description:
Since the move to cmake, the kernel static library that is installed after a cmake --install build is unusable. It lacks symbols for the internal libraries, besides those defined in the kernel library target.
Fix this by explicitly installing all the required internal static libraries. To make usage of these installed libraries easy, add a pkg-config file that can be used during linking.
This patch can be tested with:
```
cmake -B build -DBUILD_SHARED_LIBS=OFF -DBUILD_KERNEL_LIB=ON
cmake --build build
cmake --install build
g++ -std=c++20 -o test_chainstate src/bitcoin-chainstate.cpp -I/home/drgrid/bitcoin/src $(pkg-config --libs --static libbitcoinkernel)
```
Attempts to solve #30801
ACKs for top commit:
hebasto:
ACK 0dd16d7118.
fanquake:
ACK 0dd16d7118 - this looks like a good place to start.
ryanofsky:
Code review ACK 0dd16d7118
Tree-SHA512: 92f7bc959584bdc595f4aa6d0ab133355481075fe8564224fd7ac122fd7bdd75f98cf26ef0a6a7d84fd552d2258ddca1b674eca91122469a58bacc5f0a0ec2ef
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