fix travis

.travis.yml

@@ -38,6 +38,6 @@ before_script:
   - cd $TRAVIS_BUILD_DIR/..
   - git clone --depth=1 https://github.com/xbmc/xbmc.git
   - cd pvr.vdr.vnsi && mkdir build && cd build
-  - cmake -DADDONS_TO_BUILD=pvr.vdr.vnsi -DADDON_SRC_PREFIX=../.. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=../../xbmc/addons -DPACKAGE_ZIP=1 ../../xbmc/project/cmake/addons
+  - cmake -DADDONS_TO_BUILD=pvr.vdr.vnsi -DADDON_SRC_PREFIX=$TRAVIS_BUILD_DIR/.. -DCMAKE_BUILD_TYPE=Debug -DCMAKE_INSTALL_PREFIX=$TRAVIS_BUILD_DIR/../xbmc/addons -DPACKAGE_ZIP=1 $TRAVIS_BUILD_DIR/../xbmc/project/cmake/addons
 
 script: make