Linux

refactor tests for invalid format items #1186

Job	Run time
linux, debug, ansi	5m 28s
linux, release, static library	7m 39s
linux, all features disabled, debug	1m 45s
linux, all features disabled, release	3m 28s
linux, with c++, debug	52s
linux, with c++, release	48s
linux, debug	5m 23s
linux, fuzzer build	13s
linux, release	5m 48s
linux, release, ansi	5m 45s
linux, release, single file library	5m 29s
	42m 38s

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