Fix link of MSVC built abseil in Clang/LLVM projects#2054
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Currently there is a linking issue when using Clang/LLVM and the MSVC built Abseil (like the vcpkg one) due to the propagation of the linker flags and linker mismatch.
clang++: error: unknown argument: '-ignore:4221'There are more details and a repository to reproduce the issue under #1712
This change keeps the default linker flags private to Abseil targets by moving them to
target_link_options()instead of exporting them throughtarget_link_libraries(). It also removes duplicated default linker flags from generated pkg-config output.