Compile failure on OS X 10.7 clang with OpenSSL 1.0.2e

[Paul Kehrer]

https://git.openssl.org/gitweb/?p=openssl.git;a=commitdiff;h=301a6dcd4590fb2f69d08259577e215b4cc3caa3#patch5 added a check to see if it should use the ADDX instructions based on the clang version. Unfortunately, on older versions of clang on OS X this check incorrectly returns true and compilation then fails due to not knowing the instructions:

x86_64-mont.s:966:2 error: invalid instruction mnemonic 'adcxq'
adcxq %rax,%r12
^~~~~

The version of the compiler in question is: `Apple LLVM version 4.2 (clang-425.0.28) (based on LLVM 3.2svn)` (On an ancient OS X 10.7 VM)

This issue was also filed in Github (https://github.com/openssl/openssl/issues/494)
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