Commit 3290e34

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Fix

error: reinterpret_cast from 'const __FlashStringHelper *' (aka 'const __attribute__((address_space(1))) char *') to 'const char *' is not allowed

when compiling with Clang

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Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,11 @@ size_t Print::write(const uint8_t *buffer, size_t size)`
`41`	`41`	`size_t Print::print(const __FlashStringHelper *ifsh)`
`42`	`42`	`{`
`43`	`43`	`#if defined(__AVR__)`
	`44`	`+ #if defined(__clang__)`
	`45`	`+ PGM_P p = (PGM_P)(ifsh);`
	`46`	`+ #else`
`44`	`47`	`PGM_P p = reinterpret_cast<PGM_P>(ifsh);`
	`48`	`+ #endif`
`45`	`49`	`size_t n = 0;`
`46`	`50`	`while (1) {`
`47`	`51`	`unsigned char c = pgm_read_byte(p++);`

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