buildtools/cmdline: fix use in Meson subproject

Fix the following error when using dpdk as a subproject:

 subprojects/dpdk/buildtools/subproject/meson.build:28:56:
 ERROR: Unknown function "file".

This was obviously never tested in its submitted form.

Fixes: 7d8c608 ("buildtools/cmdline: allow using script in subproject")
Cc: [email protected]

Signed-off-by: Robin Jarry <[email protected]>
Acked-by: Bruce Richardson <[email protected]>

Author: rjarry

buildtools/subproject/meson.build

@@ -25,4 +25,4 @@ endif
 
 libdpdk_dep = dpdk_dep
 
-meson.override_find_program('dpdk-cmdline-gen.py', file('../dpdk-cmdline-gen.py'))
+meson.override_find_program('dpdk-cmdline-gen.py', files('../dpdk-cmdline-gen.py'))