fix ci

.travis.yml

@@ -15,6 +15,7 @@ env:
   - PLATFORM=x64 CONFIGURATION=Release
 
 script:
+  - mkdir -p build
   - cd build
   - cmake .. -DCMAKE_BUILD_TYPE=$CONFIGURATION -DTARGET_CPU=$PLATFORM
   - cmake --build . --config $CONFIGURATION

appveyor.yml

@@ -31,6 +31,7 @@ init:
 
 before_build:
   - ps: 'Write-Host "Running $env:BUILDER with $env:GENERATOR" -ForegroundColor Magenta'
+  - if not exist build mkdir build
   - cd build
   - if "%BUILDER%"=="CMake" cmake.exe .. -G "%GENERATOR%" -DCMAKE_BUILD_TYPE=%CONFIGURATION% -DTARGET_CPU=$PLATFORM