[CMake] Moved definition USE_PETSC.

Applications/ApplicationsLib/CMakeLists.txt

Applications/CLI/CMakeLists.txt

BaseLib/CMakeLists.txt

CMakeLists.txt

MathLib/CMakeLists.txt

MeshLib/CMakeLists.txt

NumLib/CMakeLists.txt

ProcessLib/CMakeLists.txt

Tests/CMakeLists.txt