[patch] rename local _C2 identifiers in stl map header files

[Olivier Hainque]

Hi Jonathan,

>> Yes, this is fine in principle. Please update the docs and change
>> _Mt to _Cmp2 though.
> 
> Sure, will adjust, test and follow up.

Revised patch attached. Bootstrapped and regression tests
fine on x86_64-linux.

2020-01-09  Olivier Hainque  <hainque@adacore.com>

	libstdc++-v3/
	* doc/xml/manual/appendix_contributing.xml: Document _C2
	as a reserved identifier, by VxWorks.
	* include/bits/stl_map.h: Rename _C2 template typenames	as _Cmp2.
	* include/bits/stl_multimap.h: Likewise.

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