Add missing library directory flag in pkgconfig file

Signed-off-by: Andrei Lebedev <[email protected]>

Author: lebdron

libprotobuf-mutator.pc.in

@@ -1,8 +1,9 @@
 prefix=@CMAKE_INSTALL_PREFIX@
+libdir=${prefix}/lib
 includedir=${prefix}/include/libprotobuf-mutator
 
 Name: libprotobuf-mutator
 Description: randomly mutate protobuffers for fuzzing
 Version: 0
 Cflags: -I${includedir} -I${includedir}/src
-Libs: -lprotobuf-mutator-libfuzzer -lprotobuf-mutator
+Libs: -L${libdir} -lprotobuf-mutator-libfuzzer -lprotobuf-mutator