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/example/meson.build b/example/meson.build
index fdab8f0..5fc4c40 100644
--- a/example/meson.build
+++ b/example/meson.build
@@ -8,5 +8,5 @@
 foreach example : examples
   executable(example, example + '.cpp',
              implicit_include_directories: false,
-             dependencies: sdeventplus)
+             dependencies: sdeventplus_dep)
 endforeach