[Ada] Remove section on pragma No_Run_Time

[Pierre-Marie de Rodat]

This pragma has been long obsolescent and confuses users.

Tested on x86_64-pc-linux-gnu, committed on trunk

2019-09-17  Ed Falis  <fa...@adacore.com>

gcc/ada/

        * doc/gnat_rm/implementation_defined_pragmas.rst: Remove
        section.
        * gnat_rm.texi, gnat_ugn.texi: Regenerate.

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