misc minor edits.

- pass string size to BLI_timestr() to avoid possible buffer overrun.
- quiet warning for mingw.
- include guards for windows utf conversion funcs.
- fix for mistage in edge-angle-selection check.
- some style cleanup.

source/blender/editors/physics/dynamicpaint_ops.c

@@ -394,7 +394,7 @@ static int dynamicPaint_initBake(struct bContext *C, struct wmOperator *op)
 		/* Format time string */
 		char time_str[30];
 		double time = PIL_check_seconds_timer() - timer;
-		BLI_timestr(time, time_str);
+		BLI_timestr(time, time_str, sizeof(time_str));
 
 		/* Show bake info */
 		BKE_reportf(op->reports, RPT_INFO, "Bake complete! (%s)", time_str);