Add Support for Annex K functions according to C11 #121

Job	Run time
cache-maker	6s
release-zephyr (./.github/do-zephyr)	1m 25s
minsize-zephyr (./.github/do-zephyr)	1m 29s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	1m 32s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	1m 30s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	2m 58s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	1m 29s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	1m 12s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	1m 16s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	1m 10s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	1m 29s
	15m 36s

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