Add info about ext.d directory to output of 'mc -F' command.

Signed-off-by: Andrew Borodin <aborodin@vmail.ru>

src/Makefile.am

@@ -12,7 +12,8 @@ AM_CPPFLAGS = \
 	-DSYSCONFDIR=\""$(sysconfdir)/@PACKAGE@/"\" \
 	-DLIBEXECDIR=\""$(libexecdir)/@PACKAGE@/"\" \
 	-DDATADIR=\""$(pkgdatadir)/"\" \
-	-DLOCALEDIR=\""$(localedir)"\"
+	-DLOCALEDIR=\""$(localedir)"\" \
+	-DEXTHELPERSDIR=\""@EXTHELPERSDIR@/"\"
 
 if CONS_SAVER
 SUBDIRS += consaver

src/textconf.c

@@ -188,6 +188,8 @@ show_datadirs_extended (void)
     PRINTF_SECTION (_("Config directory:"), mc_global.sysconfig_dir);
     PRINTF_SECTION (_("Data directory:"), mc_global.share_data_dir);
 
+    PRINTF_SECTION (_("File extension handlers:"), EXTHELPERSDIR);
+
 #if defined ENABLE_VFS_EXTFS || defined ENABLE_VFS_FISH
     PRINTF_SECTION (_("VFS plugins and scripts:"), LIBEXECDIR);
 #ifdef ENABLE_VFS_EXTFS