sage.sh: don't force the system backcall

It's masked in Gentoo and no longer needed by ipython. We can deal
with the SPKG for a few weeks until the Sage packaging catches up.

diff --git a/sage.sh b/sage.sh
index b93f8951434fc6f9888ac92c68155e4666bba531..3b063ad57a2462e11b8bd0def2138c14e3e0d0ac 100644 (file)
--- a/sage.sh
+++ b/sage.sh
@@ -48,7 +48,6 @@ sage-configure() {
     --with-system-arb=force \
     --with-system-asttokens=force \
     --with-system-attrs=force \
-    --with-system-backcall=force \
     --with-system-beniget=force \
     --with-system-boost_cropped=force \
     --with-system-brial=force \