add SKIP_KNOWN_BUGS and SKIP_INTERNET_TESTS to testsuite

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
diff --git a/testsuite/wget/wget--O-overrides--P b/testsuite/wget/wget--O-overrides--P
index fdb5d47..40a3a96 100644
--- a/testsuite/wget/wget--O-overrides--P
+++ b/testsuite/wget/wget--O-overrides--P
@@ -1,3 +1,5 @@
+test x"$SKIP_INTERNET_TESTS" != x"" && exit
+
 mkdir foo
 busybox wget -q -O index.html -P foo http://www.google.com/
 test -s index.html