gst-ffmpeg: remove 4-year old hack that sets CC directly
gst-ffmpeg: remove 4-year old hack that sets CC directly

The hack that sets CC variable directly is 4 year old and no longer required.
On the other hand, it now breaks setups when --sysroot needs to be passed to
the toolchain. Hence, remove the hack.

Signed-off-by: Denys Dmytriyenko <d29de71aea38aad3a87d486929cb0aad173ae612@ti.com>
Acked-by: Tom Rini <4c3d5c8f8c21c27dd329bd585f481113514551fd@mentor.com>

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