build: remove chrono package from depends Boost

Author: fanquake

depends/packages/boost.mk

@@ -22,7 +22,7 @@ $(package)_config_opts_armv7a_android=address-model=32
 $(package)_toolset_$(host_os)=gcc
 $(package)_archiver_$(host_os)=$($(package)_ar)
 $(package)_toolset_darwin=clang-darwin
-$(package)_config_libraries=chrono,filesystem,system,thread,test
+$(package)_config_libraries=filesystem,system,thread,test
 $(package)_cxxflags=-std=c++11 -fvisibility=hidden
 $(package)_cxxflags_linux=-fPIC
 $(package)_cxxflags_android=-fPIC