removed a c++ style comment
* app/ops_buttons.h: removed a c++ style comment * app/paint_funcs.c: applied Craig Wiegert's patch to fix the rounding errors in the scaling code. * app/paint_funcs.c: Use a mutex lock in disolve pixels instead of rand_r on linux systems since linux's rand_r appears to be broken. * app/bezier_select.c: applied Shuji Narazaki's patch that corrects for layer offsets in bezier_stroke.
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