Remove precompiled header support as per Gentoo QA policy.
Bug: https://bugs.gentoo.org/920845

diff --git a/CMakeLists.txt b/CMakeLists.txt
index 7ce313c..cb2e0c4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -32,9 +32,6 @@ set(LIB_DESTINATION
 set(CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/cmake")
 include(options.cmake)
 
-# pre-compiled headers support
-include(cotire)
-
 # if setup using the Toolchain-llvm.cmake file, then use llvm...
 if(ENABLE_LLVM)
   include(Toolchain-llvm)
diff --git a/src/contrib/CMakeLists.txt b/src/contrib/CMakeLists.txt
index 7252b73..fa4bc1a 100644
--- a/src/contrib/CMakeLists.txt
+++ b/src/contrib/CMakeLists.txt
@@ -89,8 +89,6 @@ set_target_properties(lucene++-contrib
     VERSION ${lucene++_VERSION}
     SOVERSION ${lucene++_SOVERSION})
     
-cotire(lucene++-contrib)
-
 install(TARGETS lucene++-contrib
   DESTINATION ${CMAKE_INSTALL_LIBDIR}
   COMPONENT runtime)
diff --git a/src/core/CMakeLists.txt b/src/core/CMakeLists.txt
index 657de54..564286d 100644
--- a/src/core/CMakeLists.txt
+++ b/src/core/CMakeLists.txt
@@ -78,7 +78,6 @@ set_target_properties(lucene++
     VERSION ${lucene++_VERSION}
     SOVERSION ${lucene++_SOVERSION})
 
-cotire(lucene++)
 
 
 install(TARGETS lucene++
diff --git a/src/test/CMakeLists.txt b/src/test/CMakeLists.txt
index a5c1b28..2e9f574 100644
--- a/src/test/CMakeLists.txt
+++ b/src/test/CMakeLists.txt
@@ -75,4 +75,3 @@ target_link_libraries(lucene++-tester
 ####################################
 target_compile_options(lucene++-tester PRIVATE -DLPP_EXPOSE_INTERNAL)
 
-cotire(lucene++-tester)