build: don't install Boost cmake config files

depends/packages/boost.mk

@@ -42,5 +42,5 @@ define $(package)_build_cmds
 endef
 
 define $(package)_stage_cmds
-  b2 -d0 -j4 --prefix=$($(package)_staging_prefix_dir) $($(package)_config_opts) toolset=$($(package)_toolset_$(host_os)) install
+  b2 -d0 -j4 --prefix=$($(package)_staging_prefix_dir) $($(package)_config_opts) toolset=$($(package)_toolset_$(host_os)) --no-cmake-config install
 endef