common controls updown patch

[Shane Shields]

hi all

this is just a little patch to fix the UPDOWN_GetArrowRect function where the 
midpoint is calculated by adding 1 to odd numbers. before it just added 1 to 
every number now it tests for odd numbers before adding.

Shane

Thanks Dan for the tips

Changelog:

    Shane Shields locutus at all.at
    
    updown.c UPDOWN_GetArrowRect function
    added odd number checking
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