common.opt (fshow-column): Don't mark as C ObjC C++ ObjC++.

gcc:
	* common.opt (fshow-column): Don't mark as C ObjC C++ ObjC++.

gcc/c-family:
	* c-opts.c (c_common_handle_option): Don't handle
	OPT_fshow_column.

libcpp:
	* include/cpplib.h (struct cpp_options): Remove show_column.
	* init.c (cpp_create_reader, post_options): Don't set show_column.

From-SVN: r160553