[RTEMS Project] #3143: Remove obsolete rtems_gxx_*() implementation

[RTEMS trac]

#3143: Remove obsolete rtems_gxx_*() implementation
-----------------------------+-----------------------------
 Reporter:  Sebastian Huber  |      Owner:  Sebastian Huber
     Type:  enhancement      |     Status:  assigned
 Priority:  normal           |  Milestone:  4.12.0
Component:  cpukit           |    Version:  4.12
 Severity:  normal           |   Keywords:
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 GCC versions prior to 6.1 used a RTEMS thread model based on rtems_gxx_*()
 functions. GCC version 6.1 or later uses the self-contained
 synchronization objects of Newlib <sys/lock.h> for the RTEMS thread model.

 Remove the obsolete implementation.

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Ticket URL: <http://devel.rtems.org/ticket/3143>
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