Bug#798459: mark missing symbol for -O3 build as optional

[Philip Rinn]

Hi Matthias,

I'll incorporate it in the next upload, I already fixed it in the git 
repository:

http://anonscm.debian.org/cgit/collab-maint/gtkspellmm.git/commit/?id=c54bb70041e0ec133765f1608d84e8e7150f3d55

Best,
Philip

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