[patch] Simplify the compilation commands for config/vxworks.c

[Olivier Hainque]

The patch by Joel setting up TARGET_C_PREINCLUDE exposed a possibility
to simplify/robustify the compilation commands use for another source in
the t-vxworks Makefile fragment.

We now leverage $(COMPILE) and $(POSTCOMPILE) instead of replicating
them manually for vxworks.c.

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  Olivier Hainque  <hainque@adacore.com>

    	* config/t-vxworks: Rework the vxworks.o compilation
    	rules to use $(COMPILE).

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