[gn] Unbreak build after b62488f

This is wrong -- it needs to put in the right value for
Python3_ROOT_DIR. But for now, this unbreaks the build.

Author: nico

llvm/utils/gn/secondary/compiler-rt/test/BUILD.gn

@@ -50,6 +50,7 @@ write_cmake_config("lit_common_configured") {
         rebase_path("$root_build_dir/bin/clang") + ext,
     "COMPILER_RT_TEST_COMPILER_ID=Clang",
     "Python3_EXECUTABLE=$python_path",
+    "Python3_ROOT_DIR=",  # FIXME
     "COMPILER_RT_BUILD_STANDALONE_LIBATOMIC_PYBOOL=False",
     "COMPILER_RT_DEBUG_PYBOOL=False",
     "COMPILER_RT_ENABLE_INTERNAL_SYMBOLIZER_PYBOOL=False",

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

@@ -142,6 +142,7 @@ write_lit_cfg("lit_shell_site_cfg") {
     "LLVM_HOST_TRIPLE=$llvm_current_triple",
     "LLVM_USE_SANITIZER=",
     "Python3_EXECUTABLE=$python_path",
+    "Python3_ROOT_DIR=",  # FIXME
   ]
 
   if (llvm_enable_zlib) {
@@ -167,6 +168,7 @@ write_lit_cfg("lit_unit_site_cfg") {
     "LLVM_BUILD_MODE=.",
     "LLVM_USE_SANITIZER=",
     "Python3_EXECUTABLE=$python_path",
+    "Python3_ROOT_DIR=",  # FIXME
   ]
 }