disable cotire as it's deprecated and breaks the build with newer libc++

Index: src/core/CMakeLists.txt
--- src/core/CMakeLists.txt.orig
+++ src/core/CMakeLists.txt
@@ -57,7 +57,6 @@ target_link_libraries(lucene++
     Boost::filesystem
     Boost::iostreams
     Boost::regex
-    Boost::system
     Boost::thread
     ZLIB::ZLIB
 )
@@ -78,9 +77,6 @@ set_target_properties(lucene++
     VISIBILITY_INLINES_HIDDEN 1
     VERSION ${lucene++_VERSION}
     SOVERSION ${lucene++_SOVERSION})
-
-cotire(lucene++)
-
 
 install(TARGETS lucene++
   DESTINATION "${LIB_DESTINATION}"
