AppVeyor: Get verbose output from builds

Author: muggenhor

appveyor.yml

@@ -42,6 +42,7 @@ install:
 build_script:
 - cmake -E make_directory build
 - cmake -E chdir build cmake -G "%CMAKE_GENERATOR%" -DCUKE_ENABLE_EXAMPLES=ON -DBUILD_SHARED_LIBS=ON -DBOOST_ROOT="%BOOST_ROOT%" -DBOOST_INCLUDEDIR="%BOOST_INCLUDEDIR%" -DBOOST_LIBRARYDIR="%BOOST_LIBRARYDIR%" -DCMAKE_PREFIX_PATH="%QT_DIR%" ..
+- set VERBOSE=1
 - cmake --build build
 
 test_script: