meson: Fix local boost build

Currently compilation on the system without boost fails with a message:
"""
../subprojects/sdbusplus/include/sdbusplus/asio/connection.hpp:31:10:
fatal error: boost/callable_traits.hpp: No such file or directory
   31 | #include <boost/callable_traits.hpp>
"""
Add 'boost_callable_traits' to the dependencies to fix the issue.

Change-Id: I86259c0fece57c02cd28767626661e75abde93c2
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
diff --git a/meson.build b/meson.build
index db5c9a2..ec37c55 100644
--- a/meson.build
+++ b/meson.build
@@ -33,11 +33,12 @@
   cmake = import('cmake')
   opt = cmake.subproject_options()
   opt.add_cmake_defines({
-    'BOOST_INCLUDE_LIBRARIES': 'asio'
+    'BOOST_INCLUDE_LIBRARIES': 'asio;callable_traits'
   })
   boost_cmake = cmake.subproject('boost', required: true, options: opt)
   boost_asio = boost_cmake.dependency('boost_asio').as_system()
-  boost = [boost_asio]
+  boost_callable_traits = boost_cmake.dependency('boost_callable_traits').as_system()
+  boost = [boost_asio, boost_callable_traits]
 endif
 
 # Configure and install systemd unit files