Revert "fread - 18th attempt for over map on Windows"
Revert "fread - 18th attempt for over map on Windows"

This reverts commit 4ec6b39b6771feb7a9e59b1a072c75a3f45b751e.

vlulla/data.table,jangorecki/data.table,jangorecki/data.table,vlulla/data.table,jangorecki/data.table,Rdatatable/data.table,vlulla/data.table,Rdatatable/data.table,jangorecki/data.table,vlulla/data.table,Rdatatable/data.table,Rdatatable/data.table