Cleanup leftovers from migrating depends from bitcoin

Depends still contained some leftovers, like the `wallet` target that
included bdb from bitcoin. This commit removes these unneeded targets,
the miniupnpc package and the berkeley db package. Reflect the changes
in the README as well.

contrib/depends/packages/bdb.mk

@@ -1,31 +0,0 @@
-package=bdb
-$(package)_version=4.8.30
-$(package)_download_path=https://download.oracle.com/berkeley-db
-$(package)_file_name=db-$($(package)_version).NC.tar.gz
-$(package)_sha256_hash=12edc0df75bf9abd7f82f821795bcee50f42cb2e5f76a6a281b85732798364ef
-$(package)_build_subdir=build_unix
-
-define $(package)_set_vars
-$(package)_config_opts=--disable-shared --enable-cxx --disable-replication
-$(package)_config_opts_mingw32=--enable-mingw
-$(package)_config_opts_linux=--with-pic
-$(package)_cxxflags=-std=c++11
-endef
-
-define $(package)_preprocess_cmds
-  sed -i.old 's/__atomic_compare_exchange/__atomic_compare_exchange_db/' dbinc/atomic.h && \
-  sed -i.old 's/atomic_init/atomic_init_db/' dbinc/atomic.h mp/mp_region.c mp/mp_mvcc.c mp/mp_fget.c mutex/mut_method.c mutex/mut_tas.c && \
-  cp -f $(BASEDIR)/config.guess $(BASEDIR)/config.sub dist
-endef
-
-define $(package)_config_cmds
-  ../dist/$($(package)_autoconf)
-endef
-
-define $(package)_build_cmds
-  $(MAKE) libdb_cxx-4.8.a libdb-4.8.a
-endef
-
-define $(package)_stage_cmds
-  $(MAKE) DESTDIR=$($(package)_staging_dir) install_lib install_include
-endef

contrib/depends/packages/miniupnpc.mk

@@ -1,28 +0,0 @@
-package=miniupnpc
-$(package)_version=2.0.20170509
-$(package)_download_path=http://miniupnp.free.fr/files
-$(package)_file_name=$(package)-$($(package)_version).tar.gz
-$(package)_sha256_hash=d3c368627f5cdfb66d3ebd64ca39ba54d6ff14a61966dbecb8dd296b7039f16a
-
-define $(package)_set_vars
-$(package)_build_opts=CC="$($(package)_cc)"
-$(package)_build_opts_darwin=OS=Darwin LIBTOOL="$($(package)_libtool)"
-$(package)_build_opts_mingw32=-f Makefile.mingw
-$(package)_build_env+=CFLAGS="$($(package)_cflags) $($(package)_cppflags)" AR="$($(package)_ar)"
-endef
-
-define $(package)_preprocess_cmds
-  mkdir dll && \
-  sed -e 's|MINIUPNPC_VERSION_STRING \"version\"|MINIUPNPC_VERSION_STRING \"$($(package)_version)\"|' -e 's|OS/version|$(host)|' miniupnpcstrings.h.in > miniupnpcstrings.h && \
-  sed -i.old "s|miniupnpcstrings.h: miniupnpcstrings.h.in wingenminiupnpcstrings|miniupnpcstrings.h: miniupnpcstrings.h.in|" Makefile.mingw
-endef
-
-define $(package)_build_cmds
-	$(MAKE) libminiupnpc.a $($(package)_build_opts)
-endef
-
-define $(package)_stage_cmds
-	mkdir -p $($(package)_staging_prefix_dir)/include/miniupnpc $($(package)_staging_prefix_dir)/lib &&\
-	install *.h $($(package)_staging_prefix_dir)/include/miniupnpc &&\
-	install libminiupnpc.a $($(package)_staging_prefix_dir)/lib
-endef

contrib/depends/packages/packages.mk

@@ -1,8 +1,6 @@
 packages:=boost openssl libevent zeromq cppzmq zlib expat ldns cppzmq readline libiconv qt hidapi
 native_packages := native_ccache
 
-wallet_packages=bdb
-
 darwin_native_packages = native_biplist native_ds_store native_mac_alias
 darwin_packages = sodium-darwin