[Bug fortran/58001] Make it possible to silence "Extension: Tab character in format" warning

[sgk at troutmask dot apl.washington.edu]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58001

--- Comment #3 from Steve Kargl <sgk at troutmask dot apl.washington.edu> ---
On Tue, Jul 30, 2013 at 12:59:00PM +0000, dominiq at lps dot ens.fr wrote:
> 
>       print *, "A    string    with    Tabs    instead    of    spaces"
>     print 1894
> 1894  format(    '123')
>       end
> 

According to both vi and nedit, there are no tabs in the
above code.  I assume that this is cut-n-paste from an
xterm term.