configure: remove unused dependency on sdbus++

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I6bce985409e13cdde67d2959e53b42e83b3d9a6e
diff --git a/configure.ac b/configure.ac
index 07cc7de..a08bf94 100755
--- a/configure.ac
+++ b/configure.ac
@@ -17,8 +17,6 @@
 PKG_CHECK_MODULES([SDBUSPLUS], [sdbusplus])
 PKG_CHECK_MODULES([PHOSPHOR_LOGGING], [phosphor-logging])
 
-AC_PATH_PROG([SDBUSPLUSPLUS], [sdbus++])
-
 # Checks for library functions
 LT_INIT # Required for systemd linking