If I understand these tests correctly it is to ensure that _end,
_edata and __bss_start are not made dynamic. The dynamic reloc tests
are not really necessary. (We dropped them from pr23161a and pr23161b
tests a while ago without removing the -r from readelf invocation.)
Dropping the reloc tests allows them to run for more targets.
* testsuite/ld-elf/pr23161c.rd: Rewrite.
* testsuite/ld-elf/pr23161d.rd: Delete.
* testsuite/ld-elf/shared.exp (pr23161a, pr23161b): Remove -r
from readelf check.
(libpr23161c.so, pr23161c): Likewise, and check expected readelf
output using the new pr23161c.rd.
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