Fix native triple for Raspberry Pi 5 to fix other.test_cmake_compile_features (#25028)

Author: juj

test/clang_native.py

@@ -14,6 +14,15 @@
 
 
 def get_native_triple():
+  # On Raspberry Pi 5, the target triple for native compilation must exactly
+  # match 'aarch64-linux-gnu', or clang will not find the native sysroot.
+  # Users on a Pi 5 can set environment variable
+  # EMTEST_NATIVE_COMPILATION_TRIPLE=aarch64-linux-gnu
+  # to be able to override the native triple for Pi 5 compilation.
+  native_compilation_triple = os.getenv('EMTEST_NATIVE_COMPILATION_TRIPLE')
+  if native_compilation_triple:
+    return native_compilation_triple
+
   arch = {
       'aarch64': 'arm64',
       'arm64': 'arm64',