This patch updates nios2 localplt.data so the localplt test passes in
my compile-only all-ABIs glibc testing. A new PLT entry for
__extendsfdf2 is added.
Tested for nios2.
* sysdeps/unix/sysv/linux/nios2/localplt.data: Add __extendsfdf2
for libc.so.
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