m4.include/mc-encoding.m4: fix typo.

Signed-off-by: Andrew Borodin <[email protected]>

Author: aborodin

m4.include/mc-encoding.m4

@@ -9,7 +9,7 @@ dnl @version 2025-03-22
 dnl @license GPL
 dnl @copyright Free Software Foundation, Inc.
 
-AC_DEFUN([mc_EMCODING],[
+AC_DEFUN([mc_ENCODING],[
     AC_CHECK_HEADERS([gnu/libc-version.h])
 
     dnl Solaris has different name of Windows 1251 encoding