Same as 65021761, for gmx 2020

Include plumed- in the fork name

patches/gromacs-2020.6.config

@@ -29,5 +29,8 @@ EOF
 
 plumed_before_patch(){
   plumed_patch_info
+
+  mv cmake/gmxVersionInfo.cmake cmake/gmxVersionInfo.cmake.preplumed
+  awk -v version="$PLUMED_VERSION" '/^set\(GMX_VERSION_STRING_OF_FORK/{gsub(/""/, "plumed-" version)}; {print}' cmake/gmxVersionInfo.cmake.preplumed > cmake/gmxVersionInfo.cmake
 }