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Fix pkg-config when SFML_PKGCONFIG_INSTALL_DIR is unset

Commit e5127715e64a ("Install pkgconfig only if module is built")
attempted to move the pkg-config installation rules into
`sfml_add_library`, but this fails if `SFML_PKGCONFIG_INSTALL_DIR` is
unset because this code is run before the default value is set in
`CMakeLists.txt`.

Fix by moving the `add_subdirectory(src/SFML)` line below the
pkg-config setup code.

Closes: #3504

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