build: rename dependency variable

Per [1], the naming convention for dependencies is '<project_name>_dep',
for consistency when importing the project as a meson subproject.
Rename the variable here to match this convention.

Based on [2] there appears to not be any current users of this as a
subproject which would need to be updated.

1. https://mesonbuild.com/Subprojects.html#naming-convention-for-dependency-variables
2. https://github.com/search?q=org%3Aopenbmc+get_variable&type=code

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I66082b3f667e9d00ede02184d0b008d0dd22d36b
diff --git a/src/meson.build b/src/meson.build
index e8196cc..4463db0 100644
--- a/src/meson.build
+++ b/src/meson.build
@@ -48,7 +48,7 @@
   dependencies: sdeventplus_deps,
   install: true)
 
-sdeventplus = declare_dependency(
+sdeventplus_dep = declare_dependency(
   dependencies: sdeventplus_deps,
   include_directories: sdeventplus_headers,
   link_with: sdeventplus_lib)
@@ -64,7 +64,7 @@
   name: 'sdeventplus',
   description: 'C++ systemd event wrapper',
   version: meson.project_version(),
-  libraries: sdeventplus,
+  libraries: sdeventplus_dep,
   requires: sdeventplus_reqs)
 
 install_headers(