Let GROMACS runtime logs show PLUMED patch active

Knowing which PLUMED version has patched GROMACS is potentially valuable information for GROMACS and PLUMED users and developers troubleshooting their runs.

patches/gromacs-2021.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(/""/, version)}; {print}' cmake/gmxVersionInfo.cmake.preplumed > cmake/gmxVersionInfo.cmake
 }