depends: boost: build for debug or release as requested

Also hook up cppflags there, which was missing before.

depends/packages/boost.mk

@@ -6,8 +6,10 @@ $(package)_sha256_hash=fff00023dd79486d444c8e29922f4072e1d451fc5a4d2b6075852ead7
 $(package)_patches=darwin_boost_atomic-1.patch darwin_boost_atomic-2.patch
 
 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+=variant=release threading=multi link=static -sNO_BZIP2=1 -sNO_ZLIB=1
+$(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
 $(package)_config_opts_mingw32=binary-format=pe target-os=windows threadapi=win32 runtime-link=static
@@ -26,7 +28,7 @@ endef
 define $(package)_preprocess_cmds
   patch -p2 < $($(package)_patch_dir)/darwin_boost_atomic-1.patch && \
   patch -p2 < $($(package)_patch_dir)/darwin_boost_atomic-2.patch && \
-  echo "using $(boost_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$(boost_archiver_$(host_os))\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
+  echo "using $(boost_toolset_$(host_os)) : : $($(package)_cxx) : <cxxflags>\"$($(package)_cxxflags) $($(package)_cppflags)\" <linkflags>\"$($(package)_ldflags)\" <archiver>\"$(boost_archiver_$(host_os))\" <striper>\"$(host_STRIP)\"  <ranlib>\"$(host_RANLIB)\" <rc>\"$(host_WINDRES)\" : ;" > user-config.jam
 endef
 
 define $(package)_config_cmds