We basically replace all references to CMAKE_SOURCE_DIR and CMAKE_BINARY_DIR with CMAKE_CURRENT_SOURCE_DIR and CMAKE_CURRENT_BINARY_DIR. This enables other cmake projects to take a direct dependency on this project. Test: cmake . still shows error for in source builds. Test: mkdir build && cd build && cmake .. -G Ninja && ninja succeeds Change-Id: Ibb8366f8e7fd3b3152634c71324a5182d269e647 Reviewed-on: https://swiftshader-review.googlesource.com/c/22692Reviewed-by: Lingfeng Yang <lfy@google.com> Reviewed-by: Nicolas Capens <nicolascapens@google.com> Reviewed-by: Erwin Jansen <jansene@google.com> Tested-by: Erwin Jansen <jansene@google.com>