depends: add MULTIPROCESS depends option

Builds required packages and passes --enable-multiprocess option to bitcoin build

depends/packages/boost.mk

@@ -1,7 +1,7 @@
 package=boost
 $(package)_version=1_70_0
 $(package)_download_path=https://dl.bintray.com/boostorg/release/1.70.0/source/
-$(package)_file_name=$(package)_$($(package)_version).tar.bz2
+$(package)_file_name=boost_$($(package)_version).tar.bz2
 $(package)_sha256_hash=430ae8354789de4fd19ee52f3b1f739e1fba576f0aded0897c3c2bc00fb38778
 
 define $(package)_set_vars