meson: adjust nlohmann-json dependency

- Simplify nlohmann-json dependency in meson.build.
- Use consistent dependency variable names (based on Meson style).
- Align wrap file name with meson wrapdb choice for the project.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I2e893fd8c300b36a16d704f2002bb966a6e52ce4
diff --git a/.gitignore b/.gitignore
index d5005aa..884d00c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -117,7 +117,7 @@
 !/subprojects/packagefiles/
 !/subprojects/boost.wrap
 !/subprojects/googletest.wrap
-!/subprojects/nlohmann.wrap
+!/subprojects/nlohmann_json.wrap
 !/subprojects/phosphor-logging.wrap
 !/subprojects/sdbusplus.wrap
 
diff --git a/meson.build b/meson.build
index 49fd172..19d783e 100644
--- a/meson.build
+++ b/meson.build
@@ -29,19 +29,14 @@
 boost_version = '>=1.79.0'
 boost_modules = ['coroutine', 'context']
 boost = dependency('boost',
-    version: boost_version, 
+    version: boost_version,
     modules: boost_modules)
 
+nlohmann_json_dep = dependency('nlohmann_json', include_type: 'system')
 phosphor_logging = dependency('phosphor-logging')
 sdbusplus = dependency('sdbusplus')
 systemd = dependency('systemd')
 
-if cxx.has_header('nlohmann/json.hpp')
-    nlohmann_json = declare_dependency()
-else
-    nlohmann_json = dependency('nlohmann_json')
-endif
-
 add_project_arguments(
     '-DTELEMETRY_MAX_REPORTS=' + get_option('max-reports').to_string(),
     '-DTELEMETRY_MAX_READING_PARAMS=' +
@@ -87,7 +82,7 @@
     ],
     dependencies: [
         boost,
-        nlohmann_json,
+        nlohmann_json_dep,
         sdbusplus,
         phosphor_logging,
     ],
diff --git a/subprojects/nlohmann.wrap b/subprojects/nlohmann_json.wrap
similarity index 62%
rename from subprojects/nlohmann.wrap
rename to subprojects/nlohmann_json.wrap
index 477e844..3745380 100644
--- a/subprojects/nlohmann.wrap
+++ b/subprojects/nlohmann_json.wrap
@@ -1,6 +1,6 @@
 [wrap-git]
-url = https://github.com/nlohmann/json
 revision = HEAD
+url = https://github.com/nlohmann/json.git
 
 [provide]
 nlohmann_json = nlohmann_json_dep
diff --git a/tests/meson.build b/tests/meson.build
index 9666a03..4dc883f 100644
--- a/tests/meson.build
+++ b/tests/meson.build
@@ -64,7 +64,7 @@
             boost,
             gmock_dep,
             gtest_dep,
-            nlohmann_json,
+            nlohmann_json_dep,
             phosphor_logging,
             sdbusplus,
         ],