build: a single place to define package version

Change-Id: I2cd7397895ed4852f852e99b97543dde76eaff8f

Author: jktjkt

CMakeLists.txt

@@ -21,15 +21,15 @@ add_custom_target(libyang-cpp-version-cmake
         cmake/ProjectGitVersionRunner.cmake
         )
 include(cmake/ProjectGitVersion.cmake)
-prepare_git_version(LIBYANG_CPP_VERSION "3")
+set(LIBYANG_CPP_PKG_VERSION "3")
+prepare_git_version(LIBYANG_CPP_VERSION ${LIBYANG_CPP_PKG_VERSION})
 
 find_package(Doxygen)
 option(WITH_DOCS "Create and install internal documentation (needs Doxygen)" ${DOXYGEN_FOUND})
 option(BUILD_SHARED_LIBS "By default, shared libs are enabled. Turn off for a static build." ON)
 
 find_package(PkgConfig REQUIRED)
 pkg_check_modules(LIBYANG REQUIRED libyang>=3.7.8 IMPORTED_TARGET)
-set(LIBYANG_CPP_PKG_VERSION "3")
 
 # FIXME from gcc 14.1 on we should be able to use the calendar/time from libstdc++ and thus remove the date dependency
 find_package(date)