meson: Provide wrap file for boost

Currently local build on the system without boost can fail with
the following message:
"""
meson.build: ERROR: Dependency "boost" not found, tried system
"""
Provide "boost.wrap" file to fix the issue.

Change-Id: I47af3febe4fc95e730d37305ce7d5c9230fb8a72
Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
diff --git a/.gitignore b/.gitignore
index 4603b5b..cf420b0 100644
--- a/.gitignore
+++ b/.gitignore
@@ -10,3 +10,5 @@
 /subprojects/phosphor-objmgr.wrap
 /subprojects/sdeventplus.wrap
 /subprojects/stdplus.wrap
+
+!subprojects/packagefiles