CI: disable openMP

CI/configure_option.cmake

@@ -45,7 +45,7 @@ OTB_USE_MUPARSER:BOOL=ON
 OTB_USE_MUPARSERX:BOOL=ON
 OTB_USE_OPENCV:BOOL=ON
 OTB_USE_OPENGL:BOOL=ON
-OTB_USE_OPENMP:BOOL=ON
+OTB_USE_OPENMP:BOOL=OFF
 OTB_USE_QT:BOOL=ON
 OTB_USE_QWT:BOOL=ON
 OTB_USE_SHARK:BOOL=ON