This commit addresses the following compilation errors:
In file included from /tmp/check-includes.sh.21060.c:1:0:
build/include/rte_metrics.h:91:2: error: unknown type name 'uint16_t'
[...]
It also adds C++ awareness to rte_metrics.h.
Fixes: 349950ddb9c5 ("metrics: add information metrics library")
Signed-off-by: Adrien Mazarguil <adrien.mazarguil@6wind.com>
Acked-by: Remy Horton <remy.horton@intel.com>