Add "Symbol check" to Windows

Author: hebasto

.github/workflows/ci.yml

@@ -80,6 +80,13 @@ jobs:
         run: |
           cd build/src/RelWithDebInfo && file *tests.exe bench*.exe libsecp256k1-*.dll || true
 
+      - name: Symbol check
+        run: |
+          choco install --yes --no-progress python3
+          refreshenv
+          python -m pip install lief
+          python .\tools\symbol-check.py build\src\RelWithDebInfo\libsecp256k1-2.dll
+
       - name: Check
         run: |
           ctest -C RelWithDebInfo --test-dir build -j ([int]$env:NUMBER_OF_PROCESSORS + 1)