Add support for a patch version to the cmake system.

Patch by Brad King

llvm-svn: 206425
diff --git a/llvm/cmake/modules/LLVMConfig.cmake.in b/llvm/cmake/modules/LLVMConfig.cmake.in
index 2f8d037..780001a 100644
--- a/llvm/cmake/modules/LLVMConfig.cmake.in
+++ b/llvm/cmake/modules/LLVMConfig.cmake.in
@@ -4,6 +4,7 @@
 
 set(LLVM_VERSION_MAJOR @LLVM_VERSION_MAJOR@)
 set(LLVM_VERSION_MINOR @LLVM_VERSION_MINOR@)
+set(LLVM_VERSION_PATCH @LLVM_VERSION_PATCH@)
 set(LLVM_PACKAGE_VERSION @PACKAGE_VERSION@)
 
 set(LLVM_COMMON_DEPENDS @LLVM_COMMON_DEPENDS@)