CMakeParseImplicitLinkInfo: Ignore ld -lto_library flag

Brad Kingrequested to merge
brad.king/cmake:mac-implicit-link-no-lto-flag into master

The ld tool in Xcode 8.3 now has a -lto_library <path> flag. Ignore the flag instead of accidentally parsing it as -l with to_library.

Fixes: #16766 (closed)

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