[Go] Remove obsolete lang_requires_boot_languages setting

[Eric Botcazou]

Hi,

this gets rid of the "'c++' language required by 'go' in stage 1; enabling" 
obsolete message printed by the configure script.

Tested on x86_64-suse-linux, OK for the mainline?


2016-10-09  Eric Botcazou  <ebotcazou@adacore.com>

	* config-lang.in (lang_requires_boot_languages): Delete.

-- 
Eric Botcazou
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