[RTEMS Project] #3500: Change rtems_waf's RTEMS path check from `bin` to share/rtems<version>`

[RTEMS trac]

#3500: Change rtems_waf's RTEMS path check from `bin` to share/rtems<version>`
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  Reporter:  Chris Johns  |      Owner:  (none)
      Type:  defect       |     Status:  new
  Priority:  normal       |  Milestone:  5.1
 Component:  tool         |    Version:  5
  Severity:  normal       |   Keywords:  rtems_waf libbsd
Blocked By:               |   Blocking:
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 Currently `rtems_waf` checks for a `bin` directory in the RTEMS path.
 There is no `bin` directory any more so this test needs to be changed to
 `share/rtems<version>`.

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Ticket URL: <http://devel.rtems.org/ticket/3500>
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