[PATCH PR c/42014] Make the column number display consistently

[Shujing Zhao]

Hi,
This patch is to make the column number can be displayed too since the second 
"included from" when -fshow-column is enabled.
Bootstrapped with all languages enabled at i686-pc-linux-gnu. And especially 
test this error strings by test case gcc.dg/pr36901-4.c with -fno-show-column.

Is it ok for trunk?

Thanks
Pearly
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