Try fix library path for builded python when run build extension test

Author: Alexpux

.github/workflows/mingw.yml

@@ -89,8 +89,8 @@ jobs:
         run: |
           SMOKETESTS="$(pwd)/mingw_smoketests.py"
           cd _build
-          ./python.exe "$SMOKETESTS"
-          MSYSTEM= ./python.exe "$SMOKETESTS"
+          LD_LIBRARY_PATH=$(pwd):$LD_LIBRARY_PATH ./python.exe "$SMOKETESTS"
+          LD_LIBRARY_PATH=$(pwd):$LD_LIBRARY_PATH MSYSTEM= ./python.exe "$SMOKETESTS"
 
       - name: Run tests
         shell: msys2 {0}