toolchain-scripts: pass env to post-relocate

It's useful for the post-relocate scripts to be able to see the SDK
environment, for example to see the values of CC, CXX etc. in order to
dynamically generate toolchain files.

To enable this, source the SDK environment script prior to calling the
relocate scripts.

(From OE-Core rev: adcf69ee3310171580c28e141fec6997b1f06da4)

Signed-off-by: Martin Kelly <mkelly@xevo.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/classes/toolchain-scripts.bbclass

@@ -118,11 +118,23 @@ EOF
 }
 
 toolchain_create_post_relocate_script() {
-	script=$1
-	rm -f $script
-	touch $script
+	relocate_script=$1
+	env_dir=$2
+	rm -f $relocate_script
+	touch $relocate_script
+
+	cat >> $relocate_script <<EOF
+# Source top-level SDK env scripts in case they are needed for the relocate
+# scripts.
+for env_setup_script in ${env_dir}/environment-setup-*; do
+    . \$env_setup_script
+    status=\$?
+    if [ \$status != 0 ]; then
+        echo "\$0: Failed to source \$env_setup_script with status \$status"
+        exit \$status
+    fi
+done
 
-	cat >> $script <<EOF
 if [ -d "${SDKPATHNATIVE}/post-relocate-setup.d/" ]; then
     for s in ${SDKPATHNATIVE}/post-relocate-setup.d/*; do
         if [ ! -x \$s ]; then