Bug fix: remove `shpc_create.f90` from source files

Remove `shpc_create.f90` from source files of target `eddy_graph`. It
is no longer needed since commit 50d2f596.

Overlap/CMakeLists.txt

 add_executable(eddy_graph eddy_graph.f90
-  ${PROJECT_SOURCE_DIR}/Common/shpc_open.f90
-  ${PROJECT_SOURCE_DIR}/Common/shpc_create.f90 get_snapshot.f90
+  ${PROJECT_SOURCE_DIR}/Common/shpc_open.f90 get_snapshot.f90
   overlap.f90 dispatch_snapshot.f90
   ${PROJECT_SOURCE_DIR}/Common/shpc_close.f90
   ${PROJECT_SOURCE_DIR}/Common/read_field_indices.f90