Compile garden init with required additional source file
[finishes #160518002](https://www.pivotaltracker.com/story/show/160518002)
@@ -33,7 +33,7 @@ build_gardenrunc () {
mkdir -p $GOPATH/bin
NSTAR_PATH=src/code.cloudfoundry.org/guardian/rundmc/nstar
- gcc -static -o $GOPATH/bin/init $GOPATH/src/code.cloudfoundry.org/guardian/cmd/init/init.c
+ gcc -static -o $GOPATH/bin/init $GOPATH/src/code.cloudfoundry.org/guardian/cmd/init/init.c $GOPATH/src/code.cloudfoundry.org/guardian/cmd/init/ignore_sigchild.c
go install code.cloudfoundry.org/guardian/cmd/dadoo/
go install code.cloudfoundry.org/grootfs/store/filesystems/overlayxfs/tardis
