Fix typo and make C99 check the same as is used in math.h
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@ -19,8 +19,7 @@ int _EXFUN(isxdigit,(int __c));
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int _EXFUN(tolower, (int __c));
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int _EXFUN(toupper, (int __c));
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#if !defined(__STRICT_ANSI__) || \
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(defined(__STDC_VERSION__) && __STDC_VERSION__ >= 1999901L)
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#if !defined(__STRICT_ANSI__) || defined(__cplusplus) || __STDC_VERSION__ >= 199901L
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int _EXFUN(isblank, (int __c));
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#endif
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