fixes some variables in CppInterOpconfig.cmake.in file

[anutosh491]

This was discovered while building xeus-cpp . We have the following in xeus-cpp

find_package(CppInterOp ${CppInterOp_REQUIRED_VERSION} REQUIRED)
if(CppInterOp_FOUND)
  message(STATUS "Found CppInterOp: config=${CPPINTEROP_CONFIG} dir=${CPPINTEROP_DIR} (found version=${CPPINTEROP_VERSION} compatible with Clang ${CPPINTEROP_LLVM_VERSION_MAJOR}.x)")
endif()

which ends up being

Found CppInterOp: config= dir= (found version= compatible with Clang 19.x)

So CPPINTEROP_CONFIG , CPPINTEROP_DIR, CPPINTEROP_VERSION are empty but CPPINTEROP_LLVM_VERSION_MAJOR has "19.x"

After this we could have

message(STATUS "Found CppInterOp: config=${CPPINTEROP_CMAKE_DIR} dir=${CPPINTEROP_INSTALL_PREFIX} (found version=${CPPINTEROP_LLVM_PACKAGE_VERSION} compatible with Clang ${CPPINTEROP_LLVM_VERSION_MAJOR}.x)")

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.27%. Comparing base (757e7e8) to head (0385073).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #336   +/-   ##
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  Coverage   74.27%   74.27%           
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  Files           8        8           
  Lines        3188     3188           
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  Hits         2368     2368           
  Misses        820      820