Ensure emscripten root is at the start of python path (#22230)

This avoids issues where something called e.g. `tools` already exists in
the python path.

See
emscripten-core/emsdk#1420 (comment)

Author: sbc100

test/benchmark/benchmark_sse.py

@@ -13,7 +13,7 @@
 from subprocess import Popen
 
 __rootpath__ = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-sys.path.append(__rootpath__)
+sys.path.insert(0, __rootpath__)
 
 from tools.shared import WINDOWS, CLANG_CXX, EMCC, PIPE
 from tools.shared import run_process

test/runner.py

@@ -33,7 +33,7 @@
 # Setup
 
 __rootpath__ = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
-sys.path.append(__rootpath__)
+sys.path.insert(0, __rootpath__)
 
 import jsrun
 import parallel_testsuite

tools/maint/check_struct_info.py

@@ -11,7 +11,7 @@
 script_dir = os.path.dirname(os.path.abspath(__file__))
 root_dir = os.path.dirname(os.path.dirname(script_dir))
 
-sys.path.append(root_dir)
+sys.path.insert(0, root_dir)
 
 from tools import utils
 

tools/maint/create_release.py

@@ -12,7 +12,7 @@
 script_dir = os.path.dirname(os.path.abspath(__file__))
 root_dir = os.path.dirname(os.path.dirname(script_dir))
 
-sys.path.append(root_dir)
+sys.path.insert(0, root_dir)
 from tools import shared, utils
 
 

tools/maint/update_settings_docs.py

@@ -23,7 +23,7 @@
 script_dir = os.path.dirname(os.path.abspath(__file__))
 root_dir = os.path.dirname(os.path.dirname(script_dir))
 
-sys.path.append(root_dir)
+sys.path.insert(0, root_dir)
 
 from tools.utils import path_from_root, read_file, safe_ensure_dirs