[Bug 754902] cerbero: Should consider sysroot when building PKG_CONFIG env

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754902

--- Comment #1 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Created attachment 311175
  --> https://bugzilla.gnome.org/attachment.cgi?id=311175&action=edit
Include sysroot value when building pkg-config env

The problem was that when cross-compiling and in need to link against
system library, we would pick .pc files from the host rather then from
the sysroot.

This patch simply prepent the sysroot configuration (if set) so .pc file
is now picked from the sysroot when needed (and allowed).

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