package/go: Set file timestamp

Set all file timestamps to prevent the go compiler from rebuilding any
built in packages when programs are built.

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

package/go/go.mk

@@ -107,6 +107,10 @@ define HOST_GO_INSTALL_CMDS
 	# There is a known issue which requires the go sources to be installed
 	# https://golang.org/issue/2775
 	cp -a $(@D)/src $(HOST_GO_ROOT)/
+
+	# Set all file timestamps to prevent the go compiler from rebuilding any
+	# built in packages when programs are built.
+	find $(HOST_GO_ROOT) -type f -exec touch -r $(HOST_GO_TMP)/bin/go {} \;
 endef
 
 $(eval $(host-generic-package))