build: Make a src subdirectory

This will allow us to organize our c++ source separately from our
top-level metadata.

Change-Id: I3141fa63bf9be2ae1b1efee7a6f95ba53a569f5d
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/meson.build b/meson.build
index cf1ec16..6f9c3c5 100644
--- a/meson.build
+++ b/meson.build
@@ -8,41 +8,7 @@
     'cpp_std=c++20',
   ])
 
-# CLI11 might not have a pkg-config. It is header only so just make
-# sure we can access the needed symbols from the header.
-cli11_dep = dependency('cli11', required: false)
-has_cli11 = meson.get_compiler('cpp').has_header_symbol(
-  'CLI/CLI.hpp',
-  'CLI::App',
-  dependencies: cli11_dep,
-  required: false)
-assert(has_cli11, 'CLI11 is required')
-
-executable(
-  'kcsbridged',
-  'kcsbridged.cpp',
-  implicit_include_directories: false,
-  dependencies: [
-    dependency(
-      'boost',
-      modules: [
-        'coroutine',
-        'context',
-      ],
-    ),
-    cli11_dep,
-    dependency('phosphor-logging'),
-    dependency('sdbusplus'),
-  ],
-  cpp_args: [
-    '-DBOOST_ASIO_DISABLE_THREADS',
-    '-DBOOST_ALL_NO_LIB',
-    '-DBOOST_SYSTEM_NO_DEPRECATED',
-    '-DBOOST_ERROR_CODE_HEADER_ONLY',
-    '-DBOOST_COROUTINES_NO_DEPRECATION_WARNING',
-  ],
-  install: true,
-  install_dir: get_option('bindir'))
+subdir('src')
 
 systemd = dependency('systemd')
 if systemd.found()