Linux

Document Undocumented Functions in entry.h for Issue #371 #883

Job	Run time
linux, all features disabled, debug	1m 40s
linux, with c++, debug	48s
linux, debug	4m 15s
linux, all features disabled, release	3m 9s
linux, debug, ansi	4m 18s
linux, release	5m 20s
linux, release, ansi	5m 40s
linux, release, single file library	5m 31s
linux, release, static library	6m 59s
linux, with c++, release	55s
linux, fuzzer build	24s
	38m 59s

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