do not include math modules in the default -O3 optimization set
it's not clear that -O3 helps them, and gcc seems to have floating
point optimization bugs that introduce additional failures when -O3 is
used on some of these files.
diff --git a/configure b/configure
index 327863c..87207b6 100755
--- a/configure
+++ b/configure
@@ -264,7 +264,7 @@
esac
test "$optimize" = no || tryflag CFLAGS_AUTO -Os || tryflag CFLAGS_AUTO -O2
-test "$optimize" = yes && optimize="internal,malloc,math,string"
+test "$optimize" = yes && optimize="internal,malloc,string"
if fnmatch 'no|size' "$optimize" ; then :
else