Tidy up libknot.pc - we don't expose any symbols from linked libraries, so...

Tidy up libknot.pc - we don't expose any symbols from linked libraries, so everything should be in .private

src/libknot.pc.in

@@ -9,5 +9,5 @@ URL: https://www.knot-dns.cz
 Version: @PACKAGE_VERSION@
 Requires.private: libdnssec = @PACKAGE_VERSION@, @liburcu_PKGCONFIG@
 Libs: -L${libdir} -lknot
-Libs.private: @liburcu_LIBS@ -ldnssec
-Cflags: -I${includedir} @liburcu_CFLAGS@
+Libs.private: -ldnssec @lmdb_LIBS@
+Cflags: -I${includedir} @lmdb_CFLAGS@