[libgfortran, patch] PR113223 NAMELIST internal write missing leading blank character

[Jerry D]

Committed as simple and obvious. Initial patch thanks to Steve.
When using git gcc-commit-mklog how does one add in the coauthor?

The master branch has been updated by Jerry DeLisle <jvdeli...@gcc.gnu.org>:

https://gcc.gnu.org/g:add995ec117d756e61d207041cd32f937c1a1cd9

commit r14-6986-gadd995ec117d756e61d207041cd32f937c1a1cd9
Author: Jerry DeLisle <jvdeli...@gcc.gnu.org>
Date:   Sun Jan 7 10:22:19 2024 -0800

    libgfortran: Emit a space at beginning of internal unit NML.

    PR libgfortran/113223

    libgfortran/ChangeLog:

            * io/write.c (namelist_write): If internal_unit precede 
with space.

    gcc/testsuite/ChangeLog:

            * gfortran.dg/dtio_25.f90: Update.
            * gfortran.dg/namelist_57.f90: Update.
            * gfortran.dg/namelist_65.f90: Update.