[Patch,AVR]: Fix PR target/44643

[Georg-Johann Lay]

This is fix of PR44643 which is triggerd by

http://savannah.nongnu.org/bugs/?32988

i.e. include/avr/pgmspace.h:PSTR has to be changed, too: PSTR has to
generate __c as "static const char[]", not as "static char[]". Note
that avr-libc has to be changed anyway, no matter if or if not this
patch is applied or not.


2011-04-07  Georg-Johann Lay  <avr@gjlay.de>

	PR target/44643
	* config/avr/avr.c (avr_insert_attributes): Error if non-const
	data has attribute progmem.
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