CMakeLists.txt: Explicitly look for properties-cpp
Provides a more helpful error message in case it's missing, instead of build-time failures to resolve <core/signal.h>
.
New configure-time error when it's missing:
-- Checking for module 'properties-cpp'
-- No package 'properties-cpp' found
CMake Error at /nix/store/ih3wsahlr3d787jc4kzqizp6syq6hy29-cmake-3.29.3/share/cmake-3.29/Modules/FindPkgConfig.cmake:634 (message):
The following required packages were not found:
- properties-cpp
Call Stack (most recent call first):
/nix/store/ih3wsahlr3d787jc4kzqizp6syq6hy29-cmake-3.29.3/share/cmake-3.29/Modules/FindPkgConfig.cmake:862 (_pkg_check_modules_internal)
CMakeLists.txt:32 (pkg_check_modules)