Inhibit mlrrc usage in doc-generator scripts

doc/mk-func-h2s.sh

@@ -1,5 +1,8 @@
 #!/bin/bash
 
+# In case the user running this has a .mlrrc
+export MLRRC=__none__
+
 mlr -F | grep -v '^[a-zA-Z]' | uniq | while read funcname; do
   echo ""
   echo "<a id=\"$funcname\"/>"

doc/mkman.rb

@@ -13,6 +13,8 @@
 
 # ----------------------------------------------------------------
 def main
+  # In case the user running this has a .mlrrc
+  ENV['MLRRC'] = '__none__'
 
   print make_top