fixup float workaround

Author: fingolfin

etc/ci.sh

@@ -86,7 +86,7 @@ then
     # HACK to work out timestamp issues with anupq
     touch anupq*/configure* anupq*/Makefile* anupq*/aclocal.m4
     # HACK to prevent float from complaining about missing C-XSC
-    perl -pi -e 's;CXSC=yes;CXSC=no;' float*/configure
+    perl -pi -e 's;CXSC=yes;CXSC=no;' -e 's;CXSC=extern;CXSC=no;' float*/configure
     # PATCH Browse (proper fix has been submitted to authors)
     perl -pi -e 's;"src/string\.h";"src/stringobj.h";' Browse/src/ncurses.c