Add LibUnwind as a dependency of glog::glog (#1058)

[Atry]

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Summary: X-link: https://github.com/facebook/watchman/pull/1058

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LibUnwind is a dependency of glog according to objdump. This diff adds ${LIBUNWIND_LIBRARY} to the CMake imported library glog::glog as an element in the IMPORTED_LINK_INTERFACE_LIBRARIES property.

Without this diff, there will be a linker error like this:

/usr/bin/ld: /usr/lib/x86_64-linux-gnu/libglog.so: undefined reference to symbol '_Ux86_64_getcontext'
//usr/lib/x86_64-linux-gnu/libunwind.so.8: error adding symbols: DSO missing from command line
collect2: error: ld returned 1 exit status

Differential Revision: D39340650

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This pull request was exported from Phabricator. Differential Revision: D39340650

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This pull request has been merged in facebook/hhvm@2ee29bb2db6c31af6c9423d72dcb96aaff11f777.