[Ada] Do not invoke gnatls unconditionally

[Eric Botcazou]

Even if the Ada language isn't enabled, the Make-lang.in fragment of the Ada 
compiler is processed and invokes gnatls unconditionally, which can result in 
error messages if the command isn't present.

Tested on x86_64-suse-linux, applied on the mainline.


2012-12-11  Eric Botcazou  <ebotcazou@adacore.com>

	* gcc-interface/Make-lang.in (RTS_DIR): Define only if Ada is enabled.


-- 
Eric Botcazou
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