Disable tests and mapages

Tests are forcibly statically linked to libopkg, which does not work in
a shared-only build.

Since Buildroot does not care about testsuites, just disable building the
tests. Disable manpages at the same time for the same reason.

Note: dynamically linking with libopkg is also possible, but that would
not be upstreamable (too much changes already in upstream).

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

diff -durN opkg-v0.2.2.orig/Makefile.am opkg-v0.2.2/Makefile.am
--- opkg-v0.2.2.orig/Makefile.am	2014-04-01 22:31:59.000000000 +0200
+++ opkg-v0.2.2/Makefile.am	2014-12-13 14:13:49.684618796 +0100
@@ -1,6 +1,6 @@
 ACLOCAL_AMFLAGS = -I shave
 
-SUBDIRS = libbb libopkg src tests utils man
+SUBDIRS = libbb libopkg src utils
 
 
 HOST_CPU=@host_cpu@