eject: copy po subdirectory for out-of-tree build

The po subdirectory found on the VPATH for an out-of-tree build so we
copy it over. See [1] for discussion.

[1] http://lists.openembedded.org/pipermail/openembedded-devel/2014-May/096052.html

v3: only create and populate po/ if it doesn't already exist
v4: test to see if we're building out-of-tree

Signed-off-by: Ash Charles <ashcharles@gmail.com>
Reviewed-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Martin Jansa <Martin.Jansa@gmail.com>

meta-oe/recipes-support/eject/eject_2.1.5.bb

@@ -16,6 +16,14 @@ S = "${WORKDIR}/${BPN}"
 
 PR = "r1"
 
+do_compile_prepend() {
+    # PO subdir must be in build directory
+    if [ ! ${S} = ${B} ]; then
+        mkdir -p ${B}/po
+        cp -r ${S}/po/* ${B}/po/
+    fi
+}
+
 ALTERNATIVE_${PN} = "volname eject"
 ALTERNATIVE_LINK_NAME[volname] = "${bindir}/volname"
 ALTERNATIVE_LINK_NAME[eject] = "${bindir}/eject"