[Bridge] Update to RSTP lib

[Manish Talreja]

We have been using the RSTP implementation posted at this location:
https://lists.linux-foundation.org/pipermail/bridge/2008-May/005859.html

We have modified rstp.c and rstp.h to work with compilers other than gcc. Attached are two patch files that show our changes. Currently, we have tested this code with the Diab compiler (v 4.4a) and with IAR compiler (v 5.11).

Manish
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