minor: adjust boost paths to follow build image changes

Author: acmorrow

.mci.yml

@@ -133,8 +133,8 @@ cxx_driver_variables:
     ## msvc2010
     msvc2010: &with_msvc2010
       toolchain_flags: --msvc-version=10.0
-      libpath: --libpath="c:\local\boost_1_55_0\lib64-msvc-10.0"
-      cpppath: --cpppath="c:\local\boost_1_55_0"
+      libpath: --libpath="c:\local\boost_1_57_0\lib64-msvc-10.0"
+      cpppath: --cpppath="c:\local\boost_1_57_0"
       dllpath: --runtime-library-search-path="c:\local\boost_1_55_0\lib64-msvc-10.0,c:\openssl\bin,c:\sasl\bin,c:\curl\dlls"
       extrapath: --extrapath="c:\openssl,c:\sasl,c:\curl"
     ## msvc2013, 32-bit boost headers