gdb: fix use of fprintf_filtered in top.c

gdb: fix use of fprintf_filtered in top.c

A race condition in how patches were pushed causes this build failure:

      CXX    top.o
    /home/simark/src/binutils-gdb/gdb/top.c: In function ‘void print_gdb_configuration(ui_file*)’:
    /home/simark/src/binutils-gdb/gdb/top.c:1622:3: error: ‘fprintf_filtered’ was not declared in this scope; did you mean ‘printf_unfiltered’?
     1622 |   fprintf_filtered (stream, _("\
          |   ^~~~~~~~~~~~~~~~

fprintf_filtered has been removed, gdb_printf must be used now.  Fix
this.

Change-Id: I6a172ba0d53dab2e7cc43ed0ed2696c82925245b