[strace/strace] tests: modify_ldt failed in x86_64 (#118)

[xuchunmei000]

the testcase modify_ldt is still failed:
../../strace: umoven: short read (4 < 16) @0x7f354d1bbffc: Input/output error
--- exp	2020-01-17 09:53:14.565195760 +0800
+++ log	2020-01-17 09:53:14.565195760 +0800
@@ -1,9 +1,9 @@
-modify_ldt(0, NULL, 0) = -1
-modify_ldt(-629534633, 0xffffffffffffffff, 16045756814261206767) = -1
-modify_ldt(-629534633, 0x7f354d38a000, 0) = -1
-modify_ldt(-629534633, 0x7f354d389ff0, 42) = -1
-modify_ldt(-629534633, 0x7f354d38a000, 16) = -1
-modify_ldt(-629534633, 0x7f354d1bbffc, 16) = -1
-modify_ldt(-629534633, {entry_number=2206368128, base_addr=0x87868584, limit=0x8b8a8988, seg_32bit=0, contents=2, read_exec_only=1, limit_in_pages=0, seg_not_present=0, useable=0, lm=1}, 16) = -1
-modify_ldt(-629534633, {entry_number=-1, base_addr=00000000, limit=00000000, seg_32bit=1, contents=0, read_exec_only=0, limit_in_pages=0, seg_not_present=1, useable=1, lm=0}, 16) = -1
+modify_ldt(0, NULL, 0) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, 0xffffffffffffffff, 16045756814261206767) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, 0x7f354d38a000, 0) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, 0x7f354d389ff0, 42) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, 0x7f354d38a000, 16) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, 0x7f354d1bbffc, 16) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, {entry_number=2206368128, base_addr=0x87868584, limit=0x8b8a8988, seg_32bit=0, contents=2, read_exec_only=1, limit_in_pages=0, seg_not_present=0, useable=0, lm=1}, 16) = -1 ENOSYS (Function not implemented)
+modify_ldt(-629534633, {entry_number=-1, base_addr=00000000, limit=00000000, seg_32bit=1, contents=0, read_exec_only=0, limit_in_pages=0, seg_not_present=1, useable=1, lm=0}, 16) = -1 ENOSYS (Function not implemented)
 +++ exited with 0 +++
modify_ldt.gen.test: failed test: ../../strace -e trace=modify_ldt -a23 ../modify_ldt output mismatch


may be should be fixed like this:
        if (err > 0 && err < 0x1000) {
                if (rc != -1) {
                        errno = err;
                }
                printf(" %s (%m)", errno2name());
        }


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