winex11.drv: Use InitOnceExecuteOnce in has_opengl.

[Jacek Caban]

Signed-off-by: Jacek Caban <jacek at codeweavers.com>
---
 dlls/winex11.drv/opengl.c | 21 ++++++++++++---------
 1 file changed, 12 insertions(+), 9 deletions(-)


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