Bug 1496486 - Bump cbindgen. r=heycam

Differential Revision: https://phabricator.services.mozilla.com/D7756

build/moz.configure/rust.configure

@@ -294,7 +294,7 @@ cbindgen = check_prog('CBINDGEN', add_rustup_path('cbindgen'), paths=toolchain_s
 @checking('cbindgen version')
 @imports(_from='textwrap', _import='dedent')
 def cbindgen_version(cbindgen):
-    cbindgen_min_version = Version('0.6.2')
+    cbindgen_min_version = Version('0.6.4')
 
     # cbindgen x.y.z
     version = Version(check_cmd_output(cbindgen, '--version').strip().split(" ")[1])

taskcluster/scripts/misc/build-cbindgen.sh

@@ -3,7 +3,7 @@ set -x -e -v
 
 # If you update this, make sure to update the minimum version in rust.configure
 # as well.
-CBINDGEN_VERSION=v0.6.2
+CBINDGEN_VERSION=v0.6.4
 TARGET="$1"
 
 case "$(uname -s)" in