Remove the half-baked ini file caching

The caching does not clean up, and is mostly unnecessary since Linux
will cache the file anyway.

mkit/include/ini.sh

         1value) fn=_ini_greppath; limit="tail -1" ;;
         *)      die "incorrect use of \`ini()\`"
     esac
-    _ini_cached | $fn $arg | $limit
-}
-
-_ini_cached() {
-    #
-    # Load ini file to our cache (RAM disk) and cat it
-    #
-    # User should set MKIT_INI_CACHE to a ram-based file
-    # if mktemp cannot be relied upon.
-    #
-    if test -z "$_MKIT_INI_CACHED";
-    then
-        MKIT_INI_CACHE=${MKIT_INI_CACHE:-$(mktemp)}
-        _MKIT_INI_CACHED=$MKIT_INI_CACHE
-        test -r $MKIT_INI || die "cannot read MKIT_INI: $MKIT_INI"
-        cp $MKIT_INI $_MKIT_INI_CACHED
-    fi
-    cat $_MKIT_INI_CACHED
+    cat $MKIT_INI | $fn $arg | $limit
 }
 
 _ini_cat() {