mesa: rework the way we manage extra_extensions

Store pointers to the tokenized strings in the gl_extensions struct.

This way we can reuse them in glGetStringi() while we construct the
really long string only in _mesa_make_extension_string.

Only 16 pointers/strings are stored for now.

v2: Warn only once when we provide more than 16 unk. extensions, rebase

Signed-off-by: Emil Velikov <[email protected]>
Reviewed-by: Brian Paul <[email protected]> (v1)

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