x86-64: Skip -z mark-plt tests on MUSL
Skip -z mark-plt tests, which are specific to glibc, on MUSL.
PR ld/31970
* ld/testsuite/ld-x86-64/x86-64.exp: Skip -z mark-plt tests on
MUSL.
Signed-off-by: 
H.J. Lu <hjl.tools@gmail.com>
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Skip -z mark-plt tests, which are specific to glibc, on MUSL.
PR ld/31970
* ld/testsuite/ld-x86-64/x86-64.exp: Skip -z mark-plt tests on
MUSL.
Signed-off-by: H.J. Lu <hjl.tools@gmail.com>