Removing walberla app builds on windows

It looks like the tinyhhg pipeline builds walberla apps on Windows.

27>ClCompile:
         C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\bin\amd64\CL.exe /c /I"C:\cygwin64\home\build\builds\terraneo\tinyhhg\extern\fmt-3.0.1" /IC:\cygwin64\home\build\builds\terraneo\tinyhhg\src /I"C:\Boost\include\boost-1_63" /I"C:\Program Files (x86)\Microsoft SDKs\MPI\include" /IC:\cygwin64\home\build\builds\terraneo\tinyhhg\build\walberla\src /IC:\cygwin64\home\build\builds\terraneo\tinyhhg\walberla\src /nologo /W4 /WX- /MP /O2 /Ob2 /D WIN32 /D _WINDOWS /D NDEBUG /D NOMINMAX /D _WIN32_WINNT=0x501 /D WINVER=0x501 /D _CRT_SECURE_NO_WARNINGS /D _SCL_SECURE_NO_WARNINGS /D BOOST_ALL_NO_LIB /D "CMAKE_INTDIR=\"Release\"" /D _MBCS /Gm- /EHsc /MD /GS /fp:precise /Zc:wchar_t /Zc:forScope /Zc:inline /GR /Fo"SchaeferTurek.dir\Release\\" /Fd"SchaeferTurek.dir\Release\vc140.pdb" /Gd /TP /wd4127 /wd4512 /wd4913 /wd4702 /wd4505 /wd4503 /errorReport:queue  -bigobj C:\cygwin64\home\build\builds\terraneo\tinyhhg\walberla\apps\benchmarks\SchaeferTurek\SchaeferTurek.cpp