* gcc.c (C specs): Pass -f(no-)show-column to the
          preprocessor.
	* ch/lang-specs.h, cp/lang-specs.h, f/lang-specs.h,
	objc/lang-specs.h: Likewise.

	* gcc.dg/cpp-redef-2.c, gcc.dg/cpp-tradwarn1.c,
	gcc.dg/cpp-unc.c: Add -fno-show-column to compiler options.

From-SVN: r32891