x86: fix Solaris gas testsuite run

Commits 8015b1b0c1a1 ("x86-64: Never make R_X86_64_GOT64 section
relative"), d774bf9b3623 ("x86: Add tls check in gas"), and
1b714c14e40f ("x86: Turn PLT32 to PC32 only for PC-relative
relocations") all should have adjusted the Solaris counterpart of the
reloc64 test as well.