[gn build] (manually) port ce233e7146

llvm/utils/gn/secondary/lldb/test/BUILD.gn

@@ -55,6 +55,7 @@ write_lit_cfg("lit_api_site_cfg") {
     "LLDB_BUILD_INTEL_PT=0",
     "LLDB_DOTEST_ARGS=",
     "LLDB_ENABLE_PYTHON=0",
+    "LLDB_HAS_LIBCXX=",  # FIXME: support this (?)
     "LLDB_LIBS_DIR=",  # FIXME: for shared builds only (?)
     "LLDB_TEST_ARCH=$current_cpu",
     "LLDB_TEST_COMPILER=" + rebase_path("$root_build_dir/bin/clang"),
@@ -70,6 +71,7 @@ write_lit_cfg("lit_api_site_cfg") {
     "LLVM_BUILD_MODE=.",
     "LLVM_ENABLE_SHARED_LIBS=0",
     "LLVM_HOST_TRIPLE=$llvm_current_triple",
+    "LLVM_INCLUDE_DIR=" + rebase_path("$root_out_dir/include"),
     "LLVM_USE_SANITIZER=",
     "Lua_EXECUTABLE=",
     "LLDB_FRAMEWORK_DIR=XXX_framework_dir",