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/.gitignore b/.gitignore
index eb1140e..588f0fc 100644
--- a/.gitignore
+++ b/.gitignore
@@ -201,6 +201,7 @@
 # subproject directories
 /subprojects/*
 !/subprojects/*.wrap
+!/subprojects/packagefiles
 
 # Meson Directories
 meson-logs
diff --git a/meson.build b/meson.build
index 8c86fa9..12e51a3 100644
--- a/meson.build
+++ b/meson.build
@@ -287,20 +287,14 @@
 
 boost = dependency('boost',version : '>=1.79.0', required : false, include_type: 'system')
 if not boost.found()
-  subproject('boost', required: false)
-  boost_inc = include_directories('subprojects/boost_1_80_0/', is_system:true)
-  boost  = declare_dependency(include_directories : boost_inc)
-  boost = boost.as_system('system')
+  boost = subproject('boost', required: true).get_variable('boost_dep')
 endif
 bmcweb_dependencies += boost
 
 if cxx.has_header('boost/url/url_view.hpp')
   boost_url = declare_dependency()
 else
-  subproject('boost-url', required: false)
-  boost_url_inc = include_directories('subprojects/boost-url/include', is_system:true)
-  boost_url= declare_dependency(include_directories : boost_url_inc)
-  boost_url = boost_url.as_system('system')
+  boost_url = subproject('boost-url', required: true).get_variable('boost_url_dep')
 endif
 bmcweb_dependencies += boost_url
 
diff --git a/subprojects/boost-url.wrap b/subprojects/boost-url.wrap
index 1e30bc7..d19baba 100644
--- a/subprojects/boost-url.wrap
+++ b/subprojects/boost-url.wrap
@@ -1,3 +1,6 @@
 [wrap-git]
+directory = boost-url-git
+
 revision = d740a92d38e3a8f4d5b2153f53b82f1c98e312ab
 url = https://github.com/CPPAlliance/url.git
+patch_directory = boost-url
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
diff --git a/subprojects/packagefiles/boost-url/meson.build b/subprojects/packagefiles/boost-url/meson.build
new file mode 100644
index 0000000..7e64115
--- /dev/null
+++ b/subprojects/packagefiles/boost-url/meson.build
@@ -0,0 +1,9 @@
+project('boost-url',
+    'cpp',
+    version : '0.1',
+    license : 'Boost'
+)
+
+boost_url_dep = declare_dependency(
+    include_directories : include_directories('include'),
+)
diff --git a/subprojects/packagefiles/boost/meson.build b/subprojects/packagefiles/boost/meson.build
new file mode 100644
index 0000000..9a9c2c5
--- /dev/null
+++ b/subprojects/packagefiles/boost/meson.build
@@ -0,0 +1,9 @@
+project('boost',
+    'cpp',
+    version : '1.80.0',
+    license : 'Boost'
+)
+
+boost_dep = declare_dependency(
+    include_directories : include_directories('.'),
+)