fixes appveyor.yml

.appveyor.yml

@@ -80,18 +80,19 @@ install:
     )
 
   - git clone --depth 1 https://github.com/google/snappy
-    
+
 build_script:
+  - SET PATH=%PATH:C:/Program Files/Git/usr/bin;=%
   - cd snappy
   - mkdir build
   - cd build
   - cmake .. -G "MinGW Makefiles"
   - mingw32-make
   - copy libsnappy.a C:\projects\%APPVEYOR_PROJECT_SLUG%\tests
-  
+
   - cd C:\projects\%APPVEYOR_PROJECT_SLUG%
   - nimble install -y > nul
-  
+
 test_script:
   - nimble test