rutil: compat.hxx: avoid defining __STDC_FORMAT_MACROS twice

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10611 ddefafc4-47db-0310-ae44-fa13212b10f2
rutil: compat.hxx: use third-party stdint.h and inttypes.h for Visual Studio

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10612 ddefafc4-47db-0310-ae44-fa13212b10f2
rutil, resip/stack: add casts to UInt8

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@10613 ddefafc4-47db-0310-ae44-fa13212b10f2