Fix a number of conversion and formatting issues.
Fix a number of conversion and formatting issues.

* subversion/libsvn_subr/cache-membuffer.c
  (MIN_SEGMENT_SIZE): ensure that cache sizes > 4GB work
  (svn_cache__membuffer_cache_create): formatting fixes; add missing cast

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1101091 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion