message: autogen.sh: default to GLVND
diff: @@ -15,7 +15,7 @@ exec cmake "${ROOTDIR}" \
  -DCMAKE_BUILD_TYPE="${BUILD_TYPE}" \
  -DCMAKE_CXX_FLAGS="-fdiagnostics-color=always" \
  -DCMAKE_EXPORT_COMPILE_COMMANDS="ON" \
  - -DOpenGL_GL_PREFERENCE="LEGACY" \
  + -DOpenGL_GL_PREFERENCE="GLVND" \
  -DYAML_CPP_BUILD_CONTRIB="OFF" \
  -DYAML_CPP_BUILD_TOOLS="OFF" \
  -DLIBTERMINAL_LOG_RAW="ON" \
  