networkmanager: correct test libs install source

When building out-of-tree, the test binaries are available in the build
directory, not the source directory.

Signed-off-by: Ash Charles <ashcharles@gmail.com>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-connectivity/networkmanager/networkmanager_0.9.8.0.bb

@@ -55,7 +55,7 @@ do_install_append () {
     install -d ${D}${sysconfdir}/dbus-1/event.d
     # Additional test binaries
     install -d ${D}${bindir}
-    install -m 0755 ${S}/test/.libs/libnm* ${D}${bindir}
+    install -m 0755 ${B}/test/.libs/libnm* ${D}${bindir}
 
     # Install an empty VPN folder as nm-connection-editor will happily segfault without it :o.
     # With or without VPN support built in ;).