CMakeLists.txt: read version from version.mak instead of hardcoding it

[Copilot]

CMakeLists.txt had VERSION 2.15 hardcoded, causing it to drift from the authoritative version defined in version.mak (currently 2.16).

Description

Parse PJ_VERSION_MAJOR, PJ_VERSION_MINOR, and PJ_VERSION_REV from version.mak at configure time and pass the result to project():

file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/version.mak" _version_lines)
foreach(_line IN LISTS _version_lines)
  if(_line MATCHES "^export PJ_VERSION_MAJOR[ \t]*:=[ \t]*([0-9]+)")
    set(_pj_ver_major "${CMAKE_MATCH_1}")
  elseif(_line MATCHES "^export PJ_VERSION_MINOR[ \t]*:=[ \t]*([0-9]+)")
    set(_pj_ver_minor "${CMAKE_MATCH_1}")
  elseif(_line MATCHES "^export PJ_VERSION_REV[ \t]*:=[ \t]*([0-9]+)")
    set(_pj_ver_rev "${CMAKE_MATCH_1}")
  endif()
endforeach()
# CMake VERSION field only accepts numeric components
if(_pj_ver_rev)
  set(_pj_cmake_version "${_pj_ver_major}.${_pj_ver_minor}.${_pj_ver_rev}")
else()
  set(_pj_cmake_version "${_pj_ver_major}.${_pj_ver_minor}")
endif()

project(pjproject VERSION ${_pj_cmake_version} ...)

version.mak is already the single source of truth for versioning (used by setup.py). The suffix (e.g. -dev) is intentionally excluded since CMake VERSION only accepts numeric components.

Motivation and Context

CMakeLists.txt version was stale (2.15 vs 2.16) and would require manual synchronization on every release. This change eliminates that toil.

How Has This Been Tested?

Verified cmake -S . -B build produces CMAKE_PROJECT_VERSION=2.16 matching version.mak.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the CODING STYLE of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

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