define NO_DOT_IN_LABEL only in vxworks6

[Jeff Law]

On Tue, 2020-02-25 at 17:47 -0300, Alexandre Oliva wrote:
> There was a mistake in forward-porting and contributing some
> vxworks7r2 changes, that caused a conditional to be dropped around a
> couple of preprocessor directives, needed only up to vxworks6, that
> change the compiler's behavior WRT introducing dollars and dots in
> symbol names.
> 
> This deviates GCC's behavior from the native system compiler, in a way
> that appears to have ABI implications, so we'd like to correct that,
> even at this late stage in the development cycle.
> 
> Tested with x86_64-linux-gnu-x-aarch64-vxworks7r2.  Ok to install?
> 
> 
> for  gcc/ChangeLog
> 
> 	* config/vx-common.h (NO_DOLLAR_IN_LABEL, NO_DOT_IN_LABEL): Leave
> 	them alone on vx7.
OK
jeff
>