Fix meson warnings

As written, when we pull in the boost and boost-url subprojects, we hit
problems in the meson files.

```
../meson.build:291: WARNING: include_directories sandbox violation!
```
This commit resolves this issue, by adding explicit meson.build files
for both boost and boost-url.

Tested:
meson buildlocal

No longer returns the above error, and shows
  Subprojects
    boost                                 : YES
    boost-url                             : YES

Whereas previously those two dependencies showed up as NO.

Code compiles.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: Ib25340723c8cb7d6139e3e51db023e9d90e30aab
diff --git a/subprojects/boost.wrap b/subprojects/boost.wrap
index 1c2051a..75735f4 100644
--- a/subprojects/boost.wrap
+++ b/subprojects/boost.wrap
@@ -1,4 +1,11 @@
 [wrap-file]
+directory = boost_1_80_0
+
 source_url = https://downloads.yoctoproject.org/mirror/sources/boost_1_80_0.tar.bz2
 source_hash = 1e19565d82e43bc59209a168f5ac899d3ba471d55c7610c677d4ccf2c9c500c0
 source_filename = 1_80_0.tar.bz2
+
+patch_directory = boost
+
+[provide]
+boost = boost_dep