Add Support for Annex K functions according to C11 #119

Job	Run time
cache-maker	7s
minsize-zephyr (./.github/do-zephyr)	35m 41s
release-zephyr (./.github/do-zephyr)	37m 4s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	35m 18s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	35m 20s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	35m 56s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	34m 59s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	20m 29s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	19m 29s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	17m 58s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	18m 26s
	4h 50m 47s

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