re PR ada/81105 (system-freebsd-x86.ads renamed but referenced by gcc/ada/gcc-interface/Makefile.in)

	PR ada/81105
	* gcc-interface/Makefile.in (x86 kfreebsd): Adjust system.ads setting.
	(i[3456]86-pc-gnu): Likewise.
	(x86_64 kfreebsd): Likewise.

From-SVN: r249228