Fix build with matroska

SPECS/mediastreamer2.spec

@@ -87,12 +87,16 @@ sed -i -e '/project/s/\(VERSION\)\s\+[0-9]\+\(\.[0-9]\+\)\+/\1 %{version}/' CMak
 rm -rf include/OpenGL
 
 %build
+export CXXFLAGS="%{optflags} -I%{_includedir}/bcmatroska2/"
+
 %cmake -GNinja \
   -DCMAKE_SKIP_INSTALL_RPATH:BOOL=YES \
   -DENABLE_STATIC:BOOL=NO \
   -DENABLE_STRICT:BOOL=NO \
   -DENABLE_UNIT_TESTS:BOOL=NO \
-  -DENABLE_FFMPEG:BOOL=YES
+  -DENABLE_FFMPEG:BOOL=YES \
+  -DOpenGL_GL_PREFERENCE=GLVND \
+  -DENABLE_BV16:BOOL=OFF
 %cmake_build
 
 %install