Missing target to build bundled libcares.so when using shared library build

[Apteryks]

Describe the bug

When building with the CMake flags: -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=$PWD/install "-DBUILD_DRIVER=OFF" "-DENABLE_DKMS=OFF" "-DBUILD_LIBSCAP_MODERN_BPF=ON"

The build fails with:

[ 97%] Built target grpcpp_channelz
make  -f CMakeFiles/check_epollexclusive.dir/build.make CMakeFiles/check_epollexclusive.dir/depend
make[5]: Entering directory '/home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc'
cd /home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc && /gnu/store/adkg318pw76pfqrgxmdrswp4j050jh7r-cmake-3.30.3/bin/cmake -E cmake_depends "Unix Makefiles" /home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc /home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc /home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc /home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc /home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc/CMakeFiles/check_epollexclusive.dir/DependInfo.cmake "--color="
make[5]: Leaving directory '/home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc'
make  -f CMakeFiles/check_epollexclusive.dir/build.make CMakeFiles/check_epollexclusive.dir/build
make[5]: Entering directory '/home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc'
make[5]: *** No rule to make target '/home/maxim/src/falcosecurity-libs/newbuild/c-ares-prefix/src/c-ares/lib/libcares.so', needed by 'check_epollexclusive'.  Stop.
make[5]: Leaving directory '/home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc'
make[4]: *** [CMakeFiles/Makefile2:1473: CMakeFiles/check_epollexclusive.dir/all] Error 2
make[4]: Leaving directory '/home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc'
make[3]: *** [Makefile:136: all] Error 2
make[3]: Leaving directory '/home/maxim/src/falcosecurity-libs/newbuild/grpc-prefix/src/grpc'
make[2]: *** [libsinsp/CMakeFiles/grpc.dir/build.make:86: grpc-prefix/src/grpc-stamp/grpc-build] Error 2
make[2]: Leaving directory '/home/maxim/src/falcosecurity-libs/newbuild'
make[1]: *** [CMakeFiles/Makefile2:1664: libsinsp/CMakeFiles/grpc.dir/all] Error 2
make[1]: Leaving directory '/home/maxim/src/falcosecurity-libs/newbuild'
make: *** [Makefile:136: all] Error 2

How to reproduce it

1. Checkout version 0.19.0 (later versions fail to build due to modern BPF driver build fails: BPF stack limit of 512 bytes is exceeded in sendmmsg.bpf.c:113:14 #2248)
2. mkdir build && cd build
3. cmake -DBUILD_SHARED_LIBS=ON -DCMAKE_INSTALL_PREFIX=$PWD/install "-DBUILD_DRIVER=OFF" "-DENABLE_DKMS=OFF" "-DBUILD_LIBSCAP_MODERN_BPF=ON" ..
4. CC=gcc make VERBOSE=1

Expected behaviour
Build should succeed.

Environment

• Falco version: 0.19.0
• System info: x86_64
• OS: Guix System
• Kernel: GNU/Linux 6.12.10
• Installation method: from source

[Apteryks]

One workaround is to provide c-ares from the system and configure with -DUSE_BUNDLED_CARES=OFF.