Complete the removal of FindBison from CMake. Noticed this when browsing
some CMake patch backlog...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@139107 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/cmake/modules/CMakeLists.txt b/cmake/modules/CMakeLists.txt
index 09979d0..2dcfa14 100644
--- a/cmake/modules/CMakeLists.txt
+++ b/cmake/modules/CMakeLists.txt
@@ -32,7 +32,6 @@
   PATTERN LLVMConfig.cmake EXCLUDE
   PATTERN LLVMConfigVersion.cmake EXCLUDE
   PATTERN LLVM-Config.cmake EXCLUDE
-  PATTERN FindBison.cmake EXCLUDE
   PATTERN GetTargetTriple.cmake EXCLUDE
   PATTERN VersionFromVCS.cmake EXCLUDE
   PATTERN CheckAtomic.cmake EXCLUDE)