try latest cmake version (maybe fixes contrib builds)

travis/build-wheels.sh

@@ -9,11 +9,11 @@ ENABLE_CONTRIB=$(<contrib.enabled)
 
 pip install $BUILD_DEPENDS
 
-echo 'Install cmake 2.8.12.2'
+echo 'Install cmake 3.9.0'
 
-wget --no-check-certificate https://cmake.org/files/v2.8/cmake-2.8.12.2.tar.gz
-tar -zxvf cmake-2.8.12.2.tar.gz
-cd cmake-2.8.12.2
+wget --no-check-certificate https://cmake.org/files/v3.9/cmake-3.9.0.tar.gz
+tar -zxvf cmake-3.9.0.tar.gz
+cd cmake-3.9.0
 ./bootstrap
 make && make install
 cd ..