depends: add shared dependency builder

See the README's in depends for documentation

depends/packages/bdb.mk

@@ -0,0 +1,29 @@
+package=bdb
+$(package)_version=4.8.30
+$(package)_download_path=http://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
+$(package)_config_opts_mingw32=--enable-mingw
+$(package)_config_opts_x86_64_linux=--with-pic
+$(package)_config_opts_arm_linux=--with-pic
+endef
+
+define $(package)_preprocess_cmds
+  sed -i.old 's/__atomic_compare_exchange/__atomic_compare_exchange_db/' dbinc/atomic.h
+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