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Disable bogus tests if char is unsigned #299

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The limits of char are architecture dependent, and all modern
architectures make it unsigned.

Fixes issue 253.

// only characters with value < 128 are char otherwise they are internally char32_t
static_assert(same_f(CTRE_GEN("\\x80"), ctre::character<char32_t{0x80}>()));
static_assert(same_f(CTRE_GEN("\\xFF"), ctre::character<char32_t{0xFF}>()));
static_assert(same_f(CTRE_GEN("\\x{FF}"), ctre::character<char32_t{0xFF}>()));
#endif
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Suggested change
#endif
#else
static_assert(same_f(CTRE_GEN("\\x80"), ctre::character<char{0x80}>()));
static_assert(same_f(CTRE_GEN("\\xFF"), ctre::character<char{0xFF}>()));
static_assert(same_f(CTRE_GEN("\\x{FF}"), ctre::character<char{0xFF}>()));
#endif

The limits of char are architecture dependent, and all modern
architectures make it unsigned.

Fixes issue 253.
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