Remove duplicate git version retrieval in CMakeLists.txt

[Copilot]

The CMakeLists.txt contained two identical execute_process blocks retrieving git version info, executing git describe --tag twice unnecessarily.

Changes:

• Removed duplicate execute_process block (lines 117-132)
• Consolidated version retrieval into single block that sets both VERSION and IMGSUITE_VERSION macros
• Preserved error handling with fallback to PROJECT_VERSION

Before:

execute_process(COMMAND git describe --tag ...)
if(${HAVE_GIT_VERSION_INFO} EQUAL 0)
  add_definitions(-DVERSION="${GIT_VERSION_INFO}")
else()
  add_definitions(-DVERSION="${PROJECT_VERSION}")
endif()

include(CTest)

execute_process(COMMAND git describe --tag ...)  # Duplicate
if(${HAVE_GIT_VERSION_INFO} EQUAL 0)
  add_definitions(-DIMGSUITE_VERSION="${GIT_VERSION_INFO}")
endif()

After:

include(CTest)

execute_process(COMMAND git describe --tag ...)
if(${HAVE_GIT_VERSION_INFO} EQUAL 0)
  add_definitions(-DVERSION="${GIT_VERSION_INFO}")
  add_definitions(-DIMGSUITE_VERSION="${GIT_VERSION_INFO}")
else()
  add_definitions(-DVERSION="${PROJECT_VERSION}")
  add_definitions(-DIMGSUITE_VERSION="${PROJECT_VERSION}")
endif()

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