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

Index: src/contrib/CMakeLists.txt
--- src/contrib/CMakeLists.txt.orig
+++ src/contrib/CMakeLists.txt
@@ -85,8 +85,6 @@ set_target_properties(lucene++
     VERSION ${lucene++_VERSION}
     SOVERSION ${lucene++_SOVERSION})
     
-cotire(lucene++-contrib)
-
 install(TARGETS lucene++-contrib
   DESTINATION "${LIB_DESTINATION}"
   COMPONENT runtime)
