Configure: clang: move -Wno-unknown-warning-option to the front
While gcc ignores unknown options of the type '-Wno-xxx', clang by default issues a warning [-Wunknown-warning-option] (see [3]), which together with '-Werror' causes the build to fail. This turned out to be a problem on the 1.0.2 stable branch in the case of the '-Wextended-offsetof' option, which was removed in version 6.0.0, but needs to be kept here in order to support older clang versions, too (see #9446). Incidentally, master and 1.1.1 branch already contained the -Wno-unknown-warning-option option. Due to its special role and its importance, this commit adds an explaining commit message and moves the option to the front. [extended tests] Reviewed-by: NRichard Levitte <levitte@openssl.org> Reviewed-by: NBernd Edlinger <bernd.edlinger@hotmail.de> Reviewed-by: NPaul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/9447) (cherry picked from commit 03e5668343078b963cc6544ad7270743de13e514)
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