depends: add shared dependency builder

See the README's in depends for documentation

depends/packages/packages.mk

@@ -0,0 +1,14 @@
+packages:=boost openssl
+native_packages := native_ccache native_comparisontool
+
+qt_native_packages = native_protobuf
+qt_packages = qt qrencode protobuf
+qt_linux_packages=expat dbus libxcb xcb_proto libXau xproto freetype fontconfig libX11 xextproto libXext xtrans
+
+wallet_packages=bdb
+
+upnp_packages=miniupnpc
+
+ifneq ($(build_os),darwin)
+darwin_native_packages=native_libuuid native_openssl native_cctools native_cdrkit native_libdmg-hfsplus
+endif