[patch] Change gcc/c-format.c to add new specifiers to the Fortran front-end format

[FX Coudert]

Hi all,

This patch allows the Fortran front-end to use format specifier %u,  
as well as the l length modifier (for formats %lu, %li and %ld), by  
modifying gcc/c-format.c. This only changes the gcc_gfc format type,  
which is for use by the Fortran front-end, but I still need a review  
by a C front-end maintainer and would welcome a review by a Fortran  
maintainer for the Fortran part.

Bootstrapped and regtested on x86_64-linux, OK to commit?


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