Fix build for newlib (#12501)

Fix includes for newlib

Closes #12501

COPYBARA_INTEGRATE_REVIEW=#12501 from RiversideSC:main cfcc729
PiperOrigin-RevId: 525623814

Author: RiversideSC

src/google/protobuf/stubs/port.h

@@ -59,7 +59,7 @@
 #pragma runtime_checks("c", off)
 #endif
 #else
-#ifdef __APPLE__
+#if (defined(__APPLE__) || defined(_NEWLIB__))
 #include <machine/endian.h>  // __BYTE_ORDER
 #elif defined(__FreeBSD__)
 #include <sys/endian.h>  // __BYTE_ORDER