rpcrt4: Implement UuidCreateSequential using the machine's MAC address, when available

[Juan Lang]

This mostly uses the old implementation of UuidCreate, although it
improves it slightly:
- iphlpapi is now a delayimport, since UuidCreateSequential is used
less frequently than UuidCreate
- RtlGenRandom is used to create a random multicast address when no
MAC address is available, rather than rand()
Fixes bug 21276.
--Juan
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