[test] [depr.c.headers] XFAIL uchar.h on NetBSD

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@348973 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/depr/depr.c.headers/uchar_h.pass.cpp

@@ -10,6 +10,7 @@
 // XFAIL: suse-linux-enterprise-server-11
 // XFAIL: apple-darwin
 // XFAIL: newlib
+// XFAIL: netbsd
 
 // <uchar.h>