[picolib/ctype] Fix for conflict between C/POSIX for iswdigit() #132

Job	Run time
cache-maker	5s
release-zephyr (./.github/do-zephyr)	43m 1s
minsize-zephyr (./.github/do-zephyr)	43m 26s
release-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	43m 55s
minsize-zephyr (-Dio-float-exact=false -Dio-long-long=true -Dio-percent-b=true -Dio-long-double=t...	42m 51s
release-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	44m 43s
minsize-zephyr (-Dformat-default=integer -Dfreestanding=true -Dposix-io=false -Dnewlib-obsolete-m...	41m 33s
release-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	25m 25s
minsize-zephyr (-Dtinystdio=false, ./.github/do-zephyr)	22m 47s
minsize-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	20m 8s
release-zephyr (-Dtinystdio=false -Dnewlib-io-float=true -Dio-long-long=true -Dio-long-double=tru...	22m 50s
	5h 50m 44s

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