[Freeciv-Dev] capability patch

[Vasco Alexandre Da Silva Costa <vasc@xxxxxxxxxxxxxx>]

Since there were complains about the speed of the has_capability() &
has_capabilities() functions i looked at the code and noticed
has_capability() called my_strdup() once per call.  So i removed those
calls by changing the code.  The new functions are > 50%  faster depending
on the capstrings you're searching.

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Vasco Alexandre da Silva Costa @ Instituto Superior Tecnico, Lisboa

freeciv-cap.patch
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