recipes: Update WORKDIR references to UNPACKDIR

Since we want to be able to stop unpacking to WORKDIR, correct the WORKDIR
references in recipe do_compile/do_install tasks to use UNPACKDIR in the
appropraite places instead.

(From OE-Core rev: d73595df69667fe9d12ecd407b77a0b8dae2109c)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/repo/repo_2.45.bb

@@ -22,7 +22,7 @@ do_configure:prepend() {
 }
 
 do_install() {
-	install -D ${WORKDIR}/git/repo ${D}${bindir}/repo
+	install -D ${S}/repo ${D}${bindir}/repo
 }
 
 RDEPENDS:${PN} = "python3 git"