bug 1401647 - Fix spidermonkey mozjs / rust-bindings builds. r=nalexander

The spidermonkey mozjs and rust-bindings builds run sed on
$topsrcdir/.cargo/config.in to generate the cargo config they use, but
they previously only replaced the @top_srcdir@ substitution. This patch
makes them replace any other substitutions with an empty value to add
a bit of future-proofing.

MozReview-Commit-ID: 1DzP9vXxHMD

--HG--
extra : rebase_source : e8c0268a2a6e91ca2000b340beee2dcff0636591

.cargo/config.in

@@ -1,3 +1,8 @@
+# Note: if you add more configure substitutions here with required values
+# you will also need to fix the sed commands in:
+# taskcluster/scripts/builder/build-sm-mozjs-crate.sh
+# taskcluster/scripts/builder/build-sm-rust-bindings.sh
+
 [source.crates-io]
 registry = 'https://github.com/rust-lang/crates.io-index'
 replace-with = 'vendored-sources'

taskcluster/scripts/builder/build-sm-mozjs-crate.sh

@@ -7,7 +7,7 @@ source $(dirname $0)/sm-tooltool-config.sh
 # Ensure that we have a .config/cargo that points us to our vendored crates
 # rather than to crates.io.
 cd "$SRCDIR/.cargo"
-sed -e "s|@top_srcdir@|$SRCDIR|" < config.in | tee config
+sed -e "s|@top_srcdir@|$SRCDIR|" -e 's|@[^@]*@||g' < config.in > config
 
 cd "$SRCDIR/js/src"
 

taskcluster/scripts/builder/build-sm-rust-bindings.sh

@@ -7,7 +7,7 @@ source $(dirname $0)/sm-tooltool-config.sh
 # Ensure that we have a .config/cargo that points us to our vendored crates
 # rather than to crates.io.
 cd "$SRCDIR/.cargo"
-sed -e "s|@top_srcdir@|$SRCDIR|" < config.in | tee config
+sed -e "s|@top_srcdir@|$SRCDIR|" -e 's|@[^@]*@||g' < config.in > config
 
 cd "$SRCDIR/js/rust"