[vcpkg, libpq] separate static and shared library installations #13491
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Currently, libpq installation uses a top-level install target on non-Windows platforms. This results in having shared libraries installed even when all other libraries are static. Because CMake prefers shared libraries over static, builds result in shared library being linked, which does not correspond to triplet and other packages installations. Moreover, it causes packaging issues, since shared libraries have to be installed together with the binary.
This PR fixes the behavior by installing only libpq.a for the usual x64-linux triplet.