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.


git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@55664 954f8c5b-7b00-dc11-b283-0030488c597c