Enable standalone build

This adds the wrap files needed to build host-error-monitor using meson
directly without Yocto.

Signed-off-by: Jason M. Bills <jason.m.bills@linux.intel.com>
Change-Id: I5ee43dd5c72889b798070346dd705f3923a31690
diff --git a/meson.build b/meson.build
index 6f6a1f7..8bb3675 100644
--- a/meson.build
+++ b/meson.build
@@ -30,7 +30,11 @@
     'systemdsystemunitdir'
 )
 
-boost = dependency('boost', version: '>=1.82')
+boost = dependency('boost', version : '>=1.82.0', required : false, include_type: 'system')
+if not boost.found()
+  boost = subproject('boost', required: true).get_variable('boost_dep')
+  boost = boost.as_system('system')
+endif
 add_project_arguments(
   [
     '-DBOOST_ASIO_DISABLE_THREADS',