Add missing aliases for some Mac encodings. Bug 203838, r=jshin, sr=alecf

intl/uconv/src/charsetalias.properties

@@ -138,6 +138,10 @@ x-mac-cyrillic=x-mac-cyrillic
 x-mac-ukrainian=x-mac-ukrainian
 x-mac-hebrew=x-mac-hebrew
 x-mac-arabic=x-mac-arabic
+x-mac-farsi=x-mac-farsi
+x-mac-devanagari=x-mac-devanagari
+x-mac-gujarati=x-mac-gujarati
+x-mac-gurmukhi=x-mac-gurmukhi
 geostd8=GEOSTD8
 armscii-8=armscii-8
 x-viet-tcvn5712=x-viet-tcvn5712