[gdb/testsuite] Fix regression in step-indirect-call-thunk.exp with gcc 7
Since commit 43127ae5 ("Fix gdb.base/step-indirect-call-thunk.exp") I run into: ... gdb compile failed, gcc: error: unrecognized command line option \ '-fcf-protection=none'; did you mean '-flto-partition=none'? UNTESTED: gdb.base/step-indirect-call-thunk.exp: failed to prepare ... The problem is that -fcf-protection is supported starting gcc 8, but I'm using system gcc 7.5.0. Fix this by only adding -fcf-protection=none for gcc 8 and later. Tested on x86_64-linux, with gcc 7.5.0, 8.2.1 and 12.1.1.
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