package/go-bootstrap: Set CGO_ENABLED=0

Fixes build erorros like these:

  cgo.a(_all.o): unknown relocation type 42; compiled without -fpic?

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/go-bootstrap/go-bootstrap.mk

@@ -23,7 +23,8 @@ HOST_GO_BOOTSTRAP_MAKE_ENV = \
 	GOOS=linux \
 	GOROOT_FINAL="$(HOST_GO_BOOTSTRAP_ROOT)" \
 	GOROOT="$(@D)" \
-	GOBIN="$(@D)/bin"
+	GOBIN="$(@D)/bin" \
+	CGO_ENABLED=0
 
 define HOST_GO_BOOTSTRAP_BUILD_CMDS
 	cd $(@D)/src && $(HOST_GO_BOOTSTRAP_MAKE_ENV) ./make.bash