[patch] don't build insn-extract.o with rtl checking

[Matthias Klose]

As seen in PR98144, building insn-extract.o with rtl checking takes some memory,
and it doesn't work on 32bit architectures at all (PR97314).  Richard suggested
on irc to disable rtl checking for this auto-generated file, like it's already
done for genconditions.c.  Patching it like done for genconditons.c.  Ok for the
trunk?

Matthias

--- a/gcc/genextract.c
+++ b/gcc/genextract.c
@@ -365,6 +365,8 @@ print_header (void)
 #define IN_TARGET_CODE 1\n\
 #include \"config.h\"\n\
 #include \"system.h\"\n\
+#undef ENABLE_RTL_CHECKING\n\
+#undef ENABLE_RTL_FLAG_CHECKING\n\
 #include \"coretypes.h\"\n\
 #include \"tm.h\"\n\
 #include \"rtl.h\"\n\