Bug#1143173: mc: the reason is a variable non getting exported in m4 script

[Alex Volkov]

The variable ENCODING_ISO8859 in m4.include/mc-i18n.m4 gets set, but is 
forgotten to be exported. That's fixed upstream in a later encodings overhaul, 
but for now a patch I attached here can be useful.

diff -urb a/m4.include/mc-i18n.m4 b/m4.include/mc-i18n.m4
--- a/m4.include/mc-i18n.m4	2025-01-11 22:51:01.000000000 +0500
+++ b/m4.include/mc-i18n.m4	2026-08-18 09:40:09.694833669 +0500
@@ -40,5 +40,6 @@
 
         AC_SUBST(ENCODING_CP1251)
         AC_SUBST(ENCODING_CP866)
+        AC_SUBST(ENCODING_ISO8859)
     fi
 ])

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