Address changes in Linux 6.10 /include/linux/vmalloc.h

Address changes in Linux 6.10 /include/linux/vmalloc.h

Upstream linux kernel git commit 88ae5fb755b0d contains a number of
changes in /include/linux/vmalloc.h that affect vmalloc, vmalloc_node,
and vzalloc_node definitions.  These are no longer functions but
macros and cannot be found in the list of symbols exported by the
kernel.  Support for vzalloc, vmalloc_node, and vzalloc_node has been
in kernels since Linux 2.6.37.  Given that systemtap requires Linux
3.10 or newer there is no longer a need to check for the existence of
these functions or provide local versions of them.