Correct exclusion of prefix with fully qualified path.

Author: pmienk

.github/workflows/ci.yml

@@ -172,7 +172,7 @@ jobs:
         if: ${{ matrix.coverage == 'cov' }}
         run: |
           lcov --directory . --capture --output-file coverage.info
-          lcov --remove coverage.info "/usr/*" "../prefix/*" "${{ github.workspace }}/examples/*" "${{ github.workspace }}/test/*" --output-file coverage.info
+          lcov --remove coverage.info "/usr/*" "${{ env.LIBBITCOIN_SRC_PATH }}/prefix/*" "${{ github.workspace }}/examples/*" "${{ github.workspace }}/test/*" --output-file coverage.info
           lcov --list coverage.info
 
       - name: Coveralls.io Upload
@@ -394,7 +394,7 @@ jobs:
         if: ${{ matrix.coverage == 'cov' }}
         run: |
           lcov --directory . --capture --output-file coverage.info
-          lcov --remove coverage.info "/usr/*" "../prefix/*" "${{ github.workspace }}/examples/*" "${{ github.workspace }}/test/*" --output-file coverage.info
+          lcov --remove coverage.info "/usr/*" "${{ env.LIBBITCOIN_SRC_PATH }}/prefix/*" "${{ github.workspace }}/examples/*" "${{ github.workspace }}/test/*" --output-file coverage.info
           lcov --list coverage.info
 
       - name: Coveralls.io Upload
@@ -585,7 +585,7 @@ jobs:
         if: ${{ matrix.coverage == 'cov' }}
         run: |
           lcov --directory . --capture --output-file coverage.info
-          lcov --remove coverage.info "/usr/*" "../prefix/*" "${{ github.workspace }}/examples/*" "${{ github.workspace }}/test/*" --output-file coverage.info
+          lcov --remove coverage.info "/usr/*" "${{ env.LIBBITCOIN_SRC_PATH }}/prefix/*" "${{ github.workspace }}/examples/*" "${{ github.workspace }}/test/*" --output-file coverage.info
           lcov --list coverage.info
 
       - name: Coveralls.io Upload