scripts/randomtest: do not try building static libbysubox

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/scripts/randomtest b/scripts/randomtest
index 1809838..6359783 100755
--- a/scripts/randomtest
+++ b/scripts/randomtest
@@ -52,6 +52,7 @@
 if test x"$LIBC" = x"glibc"; then
 	cat .config \
 	| grep -v CONFIG_STATIC \
+	| grep -v CONFIG_FEATURE_LIBBUSYBOX_STATIC \
 	\
 	| grep -v CONFIG_FEATURE_2_4_MODULES \
 	| grep -v CONFIG_FEATURE_USE_BSS_TAIL \
@@ -59,6 +60,7 @@
 	>.config.new
 	mv .config.new .config
 	echo '# CONFIG_STATIC is not set' >>.config
+	echo '# CONFIG_FEATURE_LIBBUSYBOX_STATIC is not set' >>.config
 	# newer glibc (at least 2.23) no longer supply query_module() ABI.
 	# People who target 2.4 kernels would likely use older glibc (and older bbox).
 	echo '# CONFIG_FEATURE_2_4_MODULES is not set' >>.config