Fix ISO-8859-1 and US-ASCII on servers without iconv or mb_string
Fix ISO-8859-1 and US-ASCII on servers without iconv or mb_string

mblaney/simplepie,blat/simplepie,barryvdh/simplepie,simplepie/simplepie,skyzyx/simplepie,ropik/simplepie,wikidi/simplepie,blat/simplepie,simplepie/simplepie,Alexia/SimplePie,Alkarex/simplepie,wikidi/simplepie,blat/simplepie,ropik/simplepie,songfj/simplepie,gsnedders/complexpie,songfj/simplepie,Alexia/SimplePie,barryvdh/simplepie,Alkarex/simplepie,skyzyx/simplepie,barryvdh/simplepie,Alkarex/simplepie,songfj/simplepie,wikidi/simplepie,FreshRSS/simplepie,mblaney/simplepie,FreshRSS/simplepie