Commit 1171abb

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isAscii: avoid dependency on _GNU_SOURCE

Fixes #158 Thanks to @kenny5660 for the one liner

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Original file line number	Diff line number	Diff line change
`@@ -63,7 +63,7 @@ inline bool isAlpha(int c)`
`63`	`63`	`// that fits into the ASCII character set.`
`64`	`64`	`inline bool isAscii(int c)`
`65`	`65`	`{`
`66`		`- return (isascii (c) == 0 ? false : true);`
	`66`	`+ return ((c & ~0x7f) != 0 ? false : true);`
`67`	`67`	`}`
`68`	`68`
`69`	`69`

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