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
@@ -79,9 +79,6 @@ set_target_properties(lucene++
     VERSION ${lucene++_VERSION}
     SOVERSION ${lucene++_SOVERSION})
 
-cotire(lucene++)
-
-
 install(TARGETS lucene++
   DESTINATION "${LIB_DESTINATION}"
   COMPONENT runtime)
