[Ada] Simplify the VxWorks implementation of __gnat_environ

[Pierre-Marie de Rodat]

The VxWorks kernel implementation of __gnat_environ was more convoluted
than it needed to be and had an unneeded dependency on ppGlobalEnviron,
a symbol which Wind River has removed in newer versions of VxWorks. This
patch simplifies the implementation and uses a common implementation for
both VxWorks 6 and 7 kernel mode since they both support envGet.

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

gcc/ada/

	* env.c (__gnat_environ): For VxWorks kernel simply return the
	result of the envGet call. Do this for VxWorks 6 and 7 as they
	both support the same API.
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