depends: build fixes + script exec bits

depends/packages/boost.mk

@@ -1,13 +1,16 @@
 package=boost
 $(package)_version=1_64_0
-$(package)_download_path=https://dl.bintray.com/boostorg/release/1.64.0/source/
+# Bintray was shut down; use the official Boost archives mirror.
+# NOTE: download_path should NOT end with a trailing slash because the fetch
+# helper appends "/$(file)".
+$(package)_download_path=https://archives.boost.io/release/1.64.0/source
 $(package)_file_name=$(package)_$($(package)_version).tar.bz2
 $(package)_sha256_hash=7bcc5caace97baa948931d712ea5f37038dbb1c5d89b43ad4def4ed7cb683332
 
 define $(package)_set_vars
 $(package)_config_opts_release=variant=release
 $(package)_config_opts_debug=variant=debug
-$(package)_config_opts=--layout=tagged --build-type=complete --user-config=user-config.jam
+$(package)_config_opts=--layout=versioned --build-type=complete --user-config=user-config.jam
 $(package)_config_opts+=threading=multi link=static -sNO_BZIP2=1 -sNO_ZLIB=1
 $(package)_config_opts_linux=threadapi=pthread runtime-link=shared
 $(package)_config_opts_darwin=--toolset=darwin-4.2.1 runtime-link=shared
@@ -42,4 +45,4 @@ endef
 
 define $(package)_stage_cmds
   ./b2 -d0 -j4 --prefix=$($(package)_staging_prefix_dir) $($(package)_config_opts) install
-endef
+endef