[gdb/testsuite] Fix gdb_load_no_complaints with gnu-debuglink

When running test-case gdb.dwarf2/dw2-ranges-psym-warning.exp with target
board gnu-debuglink I run into:
...
(gdb) file dw2-ranges-psym-warning^M
Reading symbols from dw2-ranges-psym-warning...^M
Reading symbols from .debug/dw2-ranges-psym-warning.debug...^M
(gdb) FAIL: gdb.dwarf2/dw2-ranges-psym-warning.exp: No complaints
...

Fix this by updating the regexp in gdb_load_no_complaints.

Tested on x86_64-linux.
1 file changed