5064 ctype.h C++ regression regarding ::isblank
Reviewed by: Richard PALO <richard@netbsd.org>
Reviewed by: Garrett D'Amore <garrett@damore.org>
Approved by: Garrett D'Amore <garrett@damore.org>
	[illumos-gate merge]

commit fed328a03f5c3d431fc290ca4e36398686dc484c
    5064 ctype.h C++ regression regarding ::isblank