egl/main: no longer export internal function

With the split of the gallium egl module we had previously it required
access to some of the internal functions. As the only build (automake)
that did this no longer builds it we can now appropriately hide those
functions.

Cc: 10.5 <[email protected]>
Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Matt Turner <[email protected]>
Reviewed-by: Brian Paul <[email protected]>
(cherry picked from commit dd438ae34bdbaa6651cdd226d5fec15a892923bf)

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