[RTEMS Project] #4382: mingw - add flex to packages needed

[RTEMS trac]

#4382: mingw - add flex to packages needed
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  Reporter:  Joel Sherrill  |      Owner:  (none)
      Type:  defect         |     Status:  assigned
  Priority:  normal         |  Milestone:  6.1
 Component:  doc            |    Version:  6
  Severity:  normal         |   Keywords:
Blocked By:                 |   Blocking:
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 New install of msys2 and pacman instructions in manual missed flex.

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Ticket URL: <http://devel.rtems.org/ticket/4382>
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