If the user has MAKEFLAGS set in the environment when building the
documentation, the doc/guides/conf.py script which calls "make"
exclusively to get the project version might pick up garbage from
stdout, like:
<title>FAQ — Data Plane Development Kit make[2]:
Entering directory '/build/1st/dpdk-18.11/doc/guides'
18.11.0
make[2]: Leaving directory '/build/1st/dpdk-18.11'
documentation</title>
Override MAKEFLAGS in the Python subprocess call to avoid this issue.
Fixes: f7aaae2fe6f7 ("doc: add copyright and version")
Cc: stable@dpdk.org
Signed-off-by: Luca Boccassi <bluca@debian.org>
430b35de4a