CMakeLists.txt: remove cppad_install_includedir (no longer used).
CMakeLists.txt: remove cppad_install_includedir (no longer used).

wegamekinglc/CppAD,kaskr/CppAD,kaskr/CppAD,wegamekinglc/CppAD,wegamekinglc/CppAD,kaskr/CppAD,kaskr/CppAD,wegamekinglc/CppAD,kaskr/CppAD,wegamekinglc/CppAD