pkgconfig: link with fmt

Author: Adrien Béraud

opendht.pc.in

@@ -5,7 +5,7 @@ includedir=@includedir@
 Name: OpenDHT
 Description: C++17 Distributed Hash Table library
 Version: @VERSION@
-Libs: -L${libdir} -lopendht
+Libs: -L${libdir} -lopendht -lfmt
 Libs.private: @http_lib@ -pthread
 Requires: gnutls >= 3.3@jsoncpp_lib@@openssl_lib@
 Requires.private: nettle >= 2.4@argon2_lib@@llhttp_lib@@iouring_lib@