[Committed] Fix -fkeep-inline-functions mention of which GNU C syntax's "extern inline"

[Andrew Pinski]

After Geoff's patch, GNU C99 does not contain the old "extern inline"
definition.  This patch which I committed changes "GNU C" to "GNU C89".

Committed after a build as obvious.

Thanks,
Andrew Pinski

ChangeLog:

	* doc/invoke.texi (-fkeep-inline-functions): Change "GNU C"
	to "GNU C89".
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