Assorted code cleanups
- Clear
-Wunused-macroswarnings whenarc4random_buf()is available -
XdmcpWriteHeader: drop unnecessary cast offree()argument -
XdmcpWriteHeader: usecallocinstead ofmallocto alloc buffer
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-Wunused-macros warnings when arc4random_buf() is availableXdmcpWriteHeader: drop unnecessary cast of free() argumentXdmcpWriteHeader: use calloc instead of malloc to alloc buffer