No longer need to patch GROMACS CMake recipe for OpenMP

gromacs/gromacs-mdmodules/gmxManageColvars.cmake.diff

@@ -1,16 +1 @@
-diff --git a/cmake/gmxManageColvars.cmake b/cmake/gmxManageColvars.cmake
-index 90778221..645b23b5 100644
---- a/cmake/gmxManageColvars.cmake
-+++ b/cmake/gmxManageColvars.cmake
-@@ -54,6 +54,11 @@ function(gmx_manage_colvars)
-         target_sources(colvars INTERFACE $<TARGET_OBJECTS:colvars_objlib>)
-         target_include_directories(colvars SYSTEM INTERFACE $<BUILD_INTERFACE:${COLVARS_DIR}>)
-
-+        if(GMX_OPENMP)
-+            target_compile_options(colvars_objlib PRIVATE ${OpenMP_CXX_FLAGS})
-+            target_link_libraries(colvars_objlib PRIVATE OpenMP::OpenMP_CXX)
-+        endif()
-+
-     else()
-         # Create a dummy link target so the calling code doesn't need to know
-         # whether colvars support is being compiled.
+