Add Support for Annex K functions according to C11 #123

Job	Run time
cache-maker	6s
minsize-zephyr (./.github/do-zephyr)	35m 36s
release-zephyr (./.github/do-zephyr)	36m 7s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	34m 59s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	35m 43s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	35m 22s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	35m 19s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	19m 38s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	20m 29s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	13m 21s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	18m 5s
	4h 44m 45s

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