[CMake] Include CMakeDependentOption in libunwind
This should resolve the breakage introduced in r337867 which introduced
the use of cmake_dependent_option without include the necessary file.
git-svn-id: https://llvm.org/svn/llvm-project/libunwind/trunk@337868 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 44265b0..e460a72 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -119,6 +119,7 @@
#===============================================================================
# Setup CMake Options
#===============================================================================
+include(CMakeDependentOption)
include(HandleCompilerRT)
# Define options.
