WorkDir: Set VERSION to same value as parent project

This is a follow-up to MR !30019 where the `WorkDir` version was
hard-coded to `1.0.0`. But some of our cmake code relies on the
`CMAKE_PROJECT_VERSION` variable to be set to the same value as the
parent project. Achieve this by calling `project(...)` twice. First
without version, then a second time once we know the parent version
number.

Also remove the obsolete Doxygen work-around.

Projects/WorkDir/CMakeLists.txt

@@ -6,7 +6,9 @@
 
 # Set up the project.
 cmake_minimum_required( VERSION 3.6 )
-project( WorkDir VERSION 1.0.0 LANGUAGES C CXX )
+# Note that there is a second `project` call further below to set
+# the version and languages.
+project( WorkDir )
 
 # Let the user pick up updated AtlasCMake/AtlasLCG versions for testing.
 # Remember that it's not a problem if AtlasCMake is not found, that's why
@@ -39,11 +41,6 @@ option( ATLAS_USE_FORTRAN
    "Whether the WorkDir project should provide support for Fortran"
    ${_defaultUseFortran} )
 
-# If Fortran is needed, enable it now.
-if( ATLAS_USE_FORTRAN )
-   enable_language( Fortran )
-endif()
-
 # Clean up:
 unset( _parentProjectNames )
 unset( _defaultParentProject )
@@ -52,11 +49,6 @@ unset( _defaultUseFortran )
 # Find the project that we depend on:
 find_package( ${ATLAS_PROJECT} REQUIRED )
 
-# Temporary fix for ATLINFR-2883:
-if ( DOXYGEN_FOUND )
-   find_package( graphviz )
-endif()
-
 # Set up CTest:
 atlas_ctest_setup()
 
@@ -65,10 +57,16 @@ atlas_ctest_setup()
 set( CMAKE_EXPORT_COMPILE_COMMANDS TRUE CACHE BOOL
    "Create compile_commands.json" FORCE )
 
-# Set up a work directory project:
+# Set up a work directory project with the same version as our parent:
+project( WorkDir VERSION ${${ATLAS_PROJECT}_VERSION} LANGUAGES C CXX )
 atlas_project( USE ${ATLAS_PROJECT} ${${ATLAS_PROJECT}_VERSION}
    PROJECT_ROOT ${CMAKE_SOURCE_DIR}/../../ )
 
+# If Fortran is needed, enable it now.
+if( ATLAS_USE_FORTRAN )
+   enable_language( Fortran )
+endif()
+
 # Set up the runtime environment setup script(s):
 lcg_generate_env( SH_FILE ${CMAKE_BINARY_DIR}/${ATLAS_PLATFORM}/env_setup.sh )
 install( FILES ${CMAKE_BINARY_DIR}/${ATLAS_PLATFORM}/env_setup.sh