Patch #738325: Install optimized idlelib files.
diff --git a/Makefile.pre.in b/Makefile.pre.in
index 3bb44a4..aabeca6 100644
--- a/Makefile.pre.in
+++ b/Makefile.pre.in
@@ -878,6 +878,7 @@
 	--install-purelib=$(LIBDEST) \
 	--install-scripts=$(BINDIR) \
 	--install-platlib=$(DESTSHARED) \
+	--optimize=2 \
 	--root=/$(DESTDIR)
 
 # This installs a few of the useful scripts in Tools/scripts