fixes appveyor.yml

Author: justadudewhohacks

appveyor.yml

@@ -51,10 +51,10 @@ environment:
 install:
   - cmd: choco install OpenCV -y -version %OPENCV_VERSION%
   - if not "%BUILD_TASK%" == "ENVS" (
-      SET OPENCV_INCLUDE_DIR=c:\tools\opencv\build\include &&
-      SET OPENCV_LIB_DIR=c:\tools\opencv\build\x64\vc14\lib &&
-      SET OPENCV_BIN_DIR=c:\tools\opencv\build\x64\vc14\bin &&
-      SET PATH=%PATH%;%OPENCV_BIN_DIR%;
+      SET OPENCV_INCLUDE_DIR="c:\tools\opencv\build\include" &&
+      SET OPENCV_LIB_DIR="c:\tools\opencv\build\x64\vc14\lib" &&
+      SET OPENCV_BIN_DIR="c:\tools\opencv\build\x64\vc14\bin" &&
+      SET PATH="%PATH%;%OPENCV_BIN_DIR%;"
     )
   - ps: Install-Product node $env:nodejs_version x64
   - node --version