gst-plugins-good: Fix post_install failure when qt5 is enabled
Need to add qt5 to PKG_CONFIG_LIBDIR if the variant is enabled otherwise pkg-config will fail to find Qt5Core.pc when we're generating LA files in post_install.
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Need to add qt5 to PKG_CONFIG_LIBDIR if the variant is enabled otherwise pkg-config will fail to find Qt5Core.pc when we're generating LA files in post_install.