Files with .h extension are built with the c compiler by default, which makes
the diagnostics useless. If we know this is a cpp file, hint it so that it
builds it with the right mode.
Differential Revision: https://phabricator.services.mozilla.com/D17372
--HG--
extra : moz-landing-system : lando
Looks like ycmd fails to parse the file if the -march=arm* option is given
Removing it doesn't solve all YCM problems for Fennec, but it allows us
to use JumpToDefinition, GetType and semantic auto-completion.
--HG--
extra : rebase_source : beacdc99b7e698d6ab497c06c2c26b6a49c72d5e