win32: use posix sel_segments.c instead of win32 one on i686 MinGW to avoid MSVC asm code

Author: illwieckz

src/trusted/service_runtime/CMakeLists.txt

@@ -148,8 +148,13 @@ if (WIN32)
 		"win/nacl_ldt.c"
 		"win/nacl_thread_nice.c"
 		"win/sel_memory.c"
-		"win/sel_segments.c"
 	)
+
+	if (MSVC)
+		list(APPEND LDR_INPUTS "win/sel_segments.c")
+	else()
+		list(APPEND LDR_INPUTS "posix/x86/sel_segments.c")
+	endif()
 elseif (APPLE)
 	# Rely on the c preprocessor to discover where the mach interface definitions
 	# are located.