devtools: skip ABI check in static builds

When running make with CONFIG_RTE_BUILD_SHARED_LIB=n,
no shared library is built.
In this case, no need to run ABI check.

With meson, both shared and static libraries are always built.

Signed-off-by: Thomas Monjalon <thomas@monjalon.net>
Reviewed-by: Ray Kinsella <mdr@ashroe.eu>
Acked-by: David Marchand <david.marchand@redhat.com>