hook up libcompiler_rt, libcxx(abi) to the build

[Patrick Wildt]

Hi,

now that the Makefiles in libcompiler_rt, libcxx and libcxxabi are
guarded to not compile for !CLANG architectures, I am hopefuly that
we can simply hook them up to the build.

ok?

Patrick

diff --git a/lib/Makefile b/lib/Makefile
index 7bca1e4bf2d..70cade57caa 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -1,7 +1,8 @@
 #      $OpenBSD: Makefile,v 1.72 2016/09/23 09:18:05 sthen Exp $
 #      $NetBSD: Makefile,v 1.20.4.1 1996/06/14 17:22:38 cgd Exp $
 
-SUBDIR=        csu libarch libc libcrypto libcurses libedit libevent libexpat \
+SUBDIR=        csu libarch libc libcompiler_rt libcrypto libcurses \
+       libcxx libcxxabi libedit libevent libexpat \
        libform libfuse libkeynote libkvm libl libm libmenu \
        libossaudio libpanel libpcap libradius librthread \
        librpcsvc libskey libsndio libssl libtls libusbhid \