[pstl] Make sure we install all of PSTL's include/ directory

We want to install files directly in include/, not only in include/pstl.

llvm-svn: 368203
GitOrigin-RevId: 762e662582dd9258626ee922b2852b5e44701004
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5fb7504..24845df 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -76,7 +76,7 @@
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/ParallelSTLConfig.cmake"
               "${CMAKE_CURRENT_BINARY_DIR}/ParallelSTLConfigVersion.cmake"
         DESTINATION lib/cmake/ParallelSTL)
-install(DIRECTORY include/pstl
+install(DIRECTORY include/
         DESTINATION include)
 
 add_custom_target(install-pstl