[lldb] Excludes private headers from SWIG dependency.

lldb/scripts/CMakeLists.txt

 file(GLOB SWIG_INTERFACES interface/*.i)
 file(GLOB_RECURSE SWIG_SOURCES *.swig)
 file(GLOB SWIG_HEADERS
   ${LLDB_SOURCE_DIR}/include/lldb/API/*.h
   ${LLDB_SOURCE_DIR}/include/lldb/*.h
 )
+file(GLOB SWIG_PRIVATE_HEADERS
+  ${LLDB_SOURCE_DIR}/include/lldb/lldb-private*.h
+)
+foreach(private_header ${SWIG_PRIVATE_HEADERS})
+  list(REMOVE_ITEM SWIG_HEADERS ${private_header})
+endforeach()
 
 if(LLDB_BUILD_FRAMEWORK)
   set(framework_arg --framework --target-platform Darwin)
 endif()
 
 find_package(SWIG REQUIRED)
 set(SWIG_MIN_VERSION "2.0.0")
 if (${SWIG_VERSION} VERSION_LESS ${SWIG_MIN_VERSION})