Avoid CMake warning w/o breaking default build

[canepat]

This PR enables the CXX language in CMake script to avoid this build warning:

CMake Warning (dev) at /usr/share/cmake-3.22/Modules/GNUInstallDirs.cmake:239 (message):
  Unable to determine default CMAKE_INSTALL_LIBDIR directory because no
  target architecture is known.  Please enable at least one language before
  including GNUInstallDirs.
Call Stack (most recent call first):
  third_party/evmone/cmake/cable/CableBuildInfo.cmake:16 (include)
  CMakeLists.txt:28 (include)
This warning is for project developers.  Use -Wno-dev to suppress it.

but only after the default CMAKE_TOOLCHAIN_FILE has been set, so the build with default toolchain does not break.

[chfast]

Did you try including CableBuildInfo after project()? That's my usually fix for this warning.

[canepat]

Did you try including CableBuildInfo after project()? That's my usually fix for this warning.

Thanks a lot for this suggestion!

[codecov[bot]]

Codecov Report

Merging #792 (dccdbd5) into master (8974ae7) will increase coverage by 0.04%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #792      +/-   ##
==========================================
+ Coverage   74.95%   75.00%   +0.04%     
==========================================
  Files         197      197              
  Lines       14379    14379              
  Branches     2285     2285              
==========================================
+ Hits        10778    10785       +7     
- Misses       2621     2622       +1     
+ Partials      980      972       -8     

Impacted Files	Coverage Δ
core/silkworm/consensus/base/engine.cpp	90.90% <0.00%> (-1.71%)	:arrow_down:
core/silkworm/types/block.cpp	87.00% <0.00%> (-0.50%)	:arrow_down:
core/silkworm/execution/evm.cpp	93.84% <0.00%> (-0.50%)	:arrow_down:
core/silkworm/types/transaction.cpp	82.10% <0.00%> (+0.31%)	:arrow_up:
core/silkworm/consensus/blockchain.cpp	88.70% <0.00%> (+0.80%)	:arrow_up:
node/silkworm/rpc/server/call.hpp	70.57% <0.00%> (+0.85%)	:arrow_up:
core/silkworm/state/in_memory_state.cpp	92.18% <0.00%> (+1.04%)	:arrow_up:
node/silkworm/rpc/server/server_context_pool.cpp	61.78% <0.00%> (+1.62%)	:arrow_up:
node/silkworm/rpc/completion_end_point.cpp	95.34% <0.00%> (+6.97%)	:arrow_up:
core/silkworm/consensus/pos/engine.cpp	100.00% <0.00%> (+16.66%)	:arrow_up:

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