selftests/sgx: Discard unsupported ELF sections

Building the test enclave with -static-pie may produce a dynamic symbol
table, but this is not supported for enclaves and any relocations need to
happen manually (e.g., as for "encl_op_array"). Thus, opportunistically
discard ".dyn*" and ".gnu.hash" which the enclave loader cannot handle.

Signed-off-by: Jo Van Bulck <[e-mail]>
Signed-off-by: Dave Hansen <[e-mail]>
Reviewed-by: Jarkko Sakkinen <[e-mail]>
Link: https://lore.kernel.org/all/20231005153854.25566-13-jo.vanbulck%40cs.kuleuven.be

tools/testing/selftests/sgx/test_encl.lds

···
 		*(.note*)
 		*(.debug*)
 		*(.eh_frame*)
+		*(.dyn*)
+		*(.gnu.hash)
 	}
 }