[patch] Define STARTFILE_PREFIX_SPEC for powerpc VxWorks < 7

[Olivier Hainque]

Prior to VxWorks 7, the path where startfiles and core
libraries are located contains CPU architecture specific name
components. This should normally be expressed through a CPU
specific STARTFILE_PREFIX_SPEC for such versions of VxWorks.

This change adds a definition for the PowerPc family, which
have been using for years now.

Tested in accordance with the description in
https://gcc.gnu.org/ml/gcc-patches/2019-12/msg00911.html

Committing to mainline.

Olivier

2019-12-13  Doug Rupp  <rupp@adacore.com>

    	* config/rs6000/vxworks.h (STARTFILE_PREFIX_SPEC): Define.

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