Devin Nakamura b872f5b303 file(STRINGS): Use isprint() to test character type ...

Use the more portable `isprint()` function to test characters rather
than using hard-coded hex values.  The function is documented by the C++
standard to return non-zero for the exact range of hex values we
previously hard-coded, so this should not change behavior.

2018-07-10 13:57:07 -04:00

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