chore: Do not generate source files and use target_compile_definition… (#2369)

…s to set version

Advantages:
- not modifying src dir in build time (`git clean` will also remove
less)
- simpler codecov (if we decide to move it to separate stage in the
future)
- The cpp file is perfectly valid, so it will be treated as a C++ files
by all the tooling
- No need to use CMAKE_PROJECT_INCLUDE_BEFORE, should work fine without
it
- Instead of generating + recompiling, we will just be doing
recompilation of 1 file

cmake/ClioVersion.cmake

@@ -1,7 +1,3 @@
-#[===================================================================[
-   write version to source
-#]===================================================================]
-
 find_package(Git REQUIRED)
 
 set(GIT_COMMAND describe --tags --exact-match)
@@ -47,5 +43,3 @@ if (CMAKE_BUILD_TYPE MATCHES Debug)
 endif ()
 
 message(STATUS "Build version: ${CLIO_VERSION}")
-
-configure_file(${CMAKE_CURRENT_LIST_DIR}/Build.cpp.in ${CMAKE_CURRENT_LIST_DIR}/../src/util/build/Build.cpp)