/usr/lib/pkgconfig/gnome-keyring-sharp-1.0.pc is in libgnome-keyring1.0-cil-dev 1.0.0-3build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | prefix=/usr
exec_prefix=${prefix}
libdir=${exec_prefix}/lib
Name: Gnome.Keyring
Description: Client library to access the GNOME Keyring daemon
Version: 1.0.0
Libs: -r:${libdir}/cli/Gnome.Keyring-1.0/Gnome.Keyring.dll
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