Fix issues reported by @sylvand

cmake_modules/GenPkgConfig.cmake

example/CMakeLists.txt

example/basic_zposv/CMakeLists.txt

example/lapack_to_morse/CMakeLists.txt

example/out_of_core/CMakeLists.txt

testing/CMakeLists.txt

testing/lin/CMakeLists.txt

timing/CMakeLists.txt