Fixup mapbox variant references

This removes all dependencies on the mapbox specific variant api. The
code is now compatible with the drop in std::variant api.

Change-Id: Ie64be86ecae341def54f564eb282fb3b5356cc18
Signed-off-by: William A. Kennington III <wak@google.com>
diff --git a/CMakeLists.txt.in b/CMakeLists.txt.in
index f4f1b1e..90e653b 100644
--- a/CMakeLists.txt.in
+++ b/CMakeLists.txt.in
@@ -9,7 +9,7 @@
 externalproject_add (
     sdbusplus-project PREFIX ${CMAKE_BINARY_DIR}/sdbusplus-project
     GIT_REPOSITORY https://github.com/openbmc/sdbusplus.git GIT_TAG
-    fac43a650e59e873688d5fc6e06b5bdc88ba0546 SOURCE_DIR
+    1a3b2c68ac0f409f501d4dedde7a0fc90e9baa90 SOURCE_DIR
     ${CMAKE_BINARY_DIR}/sdbusplus-src BINARY_DIR
     ${CMAKE_BINARY_DIR}/sdbusplus-build CONFIGURE_COMMAND "" BUILD_COMMAND cd
     ${CMAKE_BINARY_DIR}/sdbusplus-src && ./bootstrap.sh && ./configure