Commit 157e976

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Fix pgm_read_ptr()'s return type

Calling this macro causes the error "'const void*' is not a pointer-to-object type" Related to arduino/ArduinoCore-API#118 Fixes bblanchon/ArduinoJson#1947

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Original file line number	Diff line number	Diff line change
`@@ -103,7 +103,7 @@ typedef const void *uint_farptr_t;`
`103`	`103`	`#define pgm_read_word(addr) ((const unsigned short )(addr))`
`104`	`104`	`#define pgm_read_dword(addr) ((const unsigned long )(addr))`
`105`	`105`	`#define pgm_read_float(addr) ((const float )(addr))`
`106`		`-#define pgm_read_ptr(addr) ((const void )(addr))`
	`106`	`+#define pgm_read_ptr(addr) ((void const *)(addr))`
`107`	`107`
`108`	`108`	`#define pgm_read_byte_near(addr) pgm_read_byte(addr)`
`109`	`109`	`#define pgm_read_word_near(addr) pgm_read_word(addr)`

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