Move peephole optimizer to separate file.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index ce8710e..fc873ea 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -260,6 +260,7 @@
 		Python/modsupport.o \
 		Python/mystrtoul.o \
 		Python/mysnprintf.o \
+		Python/peephole.o \
 		Python/pyarena.o \
 		Python/pyfpe.o \
 		Python/pystate.o \