[Bug 765394] Unset MAKEFLAGS to avoid build errors

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765394

--- Comment #1 from Xavier Claessens <xclaesse at gmail.com> ---
Created attachment 326520
  --> https://bugzilla.gnome.org/attachment.cgi?id=326520&action=edit
Unset MAKEFLAGS env variable when building makefile recipes

This avoids having user settings messing up our build.

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