update cargo submodule

Keruspe · Keruspe · commit 93528d90720c · 2017-06-30T09:38:13.000+02:00
This brings in several fixes and the new handling of __CARGO_DEFAULT_LIB_METADATA

Signed-off-by: Marc-Antoine Perennou &lt;Marc-Antoine@Perennou.com&gt;
diff --git a/src/tools/cargo b/src/tools/cargo
@@ -1 +1 @@
-Subproject commit abf01e1eddb3145c83f71b469ea7bee37141e5e1
+Subproject commit d2d6e675fcb70cfb91c2cf2fad8cdd345c120316
