build: fix meson deprecation warning

Seeing the following issue when building sdbusplus as a subproject:

    DEPRECATION: Library sdbusplus was passed to the "libraries"
    keyword argument of a previous call to generate() method
    instead of first positional argument. Adding sdbusplus to
    "Requires" field, but this is a deprecated behaviour that will
    change in a future version of Meson. Please report the issue
    if this warning cannot be avoided in your case.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5efddd8ce8040cdcbd18478e037e24652899f791
diff --git a/meson.build b/meson.build
index 6aee1c4..b116c3c 100644
--- a/meson.build
+++ b/meson.build
@@ -59,7 +59,7 @@
 )
 
 import('pkgconfig').generate(
-    libraries: libsdbusplus,
+    libsdbusplus,
     name: meson.project_name(),
     version: meson.project_version(),
     requires: libsystemd_pkg,