Fix configure script to work with Apple Clang 10
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
This is a simple fix to the configure script so it doesn't spuriously drop out for newer versions of Apple's Clang:
$ clang --version
Apple LLVM version 10.0.0 (clang-1000.10.25.5)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode-beta.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
Please do let me know if there's something wrong with my implementation; I haven't tested this on systems other than macOS so it might have silently broke something there.