Skip embedded C files on coverage

Closes #3394

Author: jeromekelleher

codecov.yml

@@ -1,16 +1,13 @@
-# ignore:
-#   - "lib/tests/"
-#   - "lib/subprojects/**/*"
+ignore:
+  - "c/tests/"
+  - "c/subprojects/**/*"
 
 codecov:
   require_ci_to_pass: false
 
 comment:
   layout: "header, diff, flags, components"  # show component info in the PR comment
 
-# fixes:
-#   - "tskit/::python/tskit/"
-#   - "^_tskitmodule.*::python/_tskitmodule.*"
 
 component_management:
   individual_components:
@@ -29,39 +26,3 @@ component_management:
       name: C library
       paths:
         - c
-
-#
-# codecov:
-#   require_ci_to_pass: false
-# comment:
-#   layout: "diff, flags, files"
-# fixes:
-#   - "tskit/::python/tskit/"
-# flag_management:
-#   individual_flags:
-#     - name: python-tests
-#       paths:
-#         - python/tskit/*.py
-#       statuses:
-#         - type: project
-#           target: 95%
-#     - name: python-c-tests
-#       paths:
-#         - python/_tskitmodule.c
-#       statuses:
-#         - type: project
-#           target: 85%
-#     - name: c-tests
-#       paths:
-#         - c/tskit/*.c
-#         - c/tskit/*.h
-#       statuses:
-#         - type: project
-#           target: 85%
-#     - name: lwt-tests
-#       paths:
-#         - python/lwt_interface/*.c
-#         - python/lwt_interface/*.h
-#       statuses:
-#         - type: project
-#           target: 80%