Merge bitcoin/bitcoin#31820: build: consistently use CLIENT_NAME in…

… libbitcoinkernel.pc.in

f5b9a2f build: use CLIENT_NAME in libbitcoinkernel.pc.in (fanquake)

Pull request description:

  Follows up from when the `pc.in` was added.

ACKs for top commit:
  davidgumberg:
    utACK bitcoin/bitcoin@f5b9a2f
  stickies-v:
    ACK f5b9a2f
  theuni:
    utACK f5b9a2f
  hebasto:
    ACK f5b9a2f.

Tree-SHA512: 7c32db919aa226f9894ed21baa3f794d1181d43d36ae56ba2d187e1a9bafd89feadc6209ab5b5a1b90d8a3de54fb910736397b1061ef48b232b59792ee250d55

libbitcoinkernel.pc.in

@@ -4,7 +4,7 @@ libdir=${prefix}/@CMAKE_INSTALL_LIBDIR@
 includedir=${prefix}/@CMAKE_INSTALL_INCLUDEDIR@
 
 Name: @CLIENT_NAME@ kernel library
-Description: Experimental library for the Bitcoin Core validation engine.
+Description: Experimental library for the @CLIENT_NAME@ validation engine.
 Version: @CLIENT_VERSION_STRING@
 Libs: -L${libdir} -lbitcoinkernel
 Libs.private: -L${libdir} @LIBS_PRIVATE@