message: Change matrix location from SOURCE to BINARY
  The matrix location is supposed to be in the binary location, to ensure
  it can be accessed and read (the source directory might not be readable
  or even mounted on some cluster configurations).
diff: @@ -38,8 +38,8 @@ namespace gko {
  namespace matrices {
  -const char *location_ani1_mtx = "@Ginkgo_SOURCE_DIR@/matrices/test/ani1.mtx";
  -const char *location_ani4_mtx = "@Ginkgo_SOURCE_DIR@/matrices/test/ani4.mtx";
  +const char *location_ani1_mtx = "@Ginkgo_BINARY_DIR@/matrices/test/ani1.mtx";
  +const char *location_ani4_mtx = "@Ginkgo_BINARY_DIR@/matrices/test/ani4.mtx";
  } // namespace matrices
  