bc: rename config options

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/head.tests b/testsuite/head.tests
index 50660d2..97bf889 100755
--- a/testsuite/head.tests
+++ b/testsuite/head.tests
@@ -31,10 +31,12 @@
 	"line 1\nline 2\n" \
 	"" ""
 
+optional FEATURE_FANCY_HEAD
 testing "head -n <negative number>" \
 	"head -n -9 head.input" \
 	"line 1\nline 2\nline 3\n" \
 	"" ""
+SKIP=
 
 rm head.input