Linux

Add benchmark for stumpless_open_buffer_target #1153

Job	Run time
linux, release	6m 11s
linux, all features disabled, debug	1m 58s
linux, debug	5m 11s
linux, debug, ansi	5m 41s
linux, release, ansi	6m 9s
linux, release, single file library	5m 37s
linux, release, static library	8m 32s
linux, all features disabled, release	3m 33s
linux, with c++, debug	2s
linux, with c++, release	3s
linux, fuzzer build	12s
	43m 9s

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