palette: Replace rand() call with custom LCG.
The custom LCG is based on the POSIX recommend constants for a 16-bit rand(). This implementation uses less computation than typical standard library procedures which have been extended for 32-bit support, is guaranteed to be reentrant, and identical everywhere. Change-Id: I3140bbd566f44ab820d131c584a5d4ec6134c5a0 Ref: http://pubs.opengroup.org/onlinepubs/9699919799/functions/rand.html
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