[V3 PATCH] Fix for defect report libstdc++/1897

[Gabriel Dos Reis]

bumgard@roguewave.com writes:

| This patch simply eliminates a warning for those of use who
| compile with -pedantic -Wall and -Werror.
| 
| 
| 2001-02-13  Greg Bumgardner <bumgard@roguewave.com>

[...]

| 	* libstdc++-v3/include/bits/ostream.tcc: Add __extension__ 
| 	to variable-length arrays.  

The right fix is to say `#pragma GCC system_header' at the top of the
file.  It is missing anyway. 

-- Gaby
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