meta: set S from UNPACKDIR in recipes that use only local files

There is no need to have two assignments; also setting S from
UNPACKDIR (and not vice versa) is more logical as unpack
task comes first, and tasks that come after unpack use S to access
unpack results.

Also adjust reference test data in selftest/recipeutils to reflect changes in test recipes.

(From OE-Core rev: f64b7e5fb3181734c8dde87b27e872a026261a74)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/qemu/nativesdk-qemu-helper_1.0.bb

@@ -18,8 +18,7 @@ SRC_URI = "file://${COREBASE}/scripts/runqemu \
            file://${COREBASE}/scripts/runqemu-export-rootfs \
           "
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 inherit nativesdk
 

meta/recipes-devtools/qemu/qemu-helper-native_1.0.bb

@@ -6,8 +6,7 @@ LIC_FILES_CHKSUM = "file://${S}/qemu-oe-bridge-helper.c;endline=4;md5=ae00a3bab8
 
 SRC_URI = "file://qemu-oe-bridge-helper.c"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 inherit native
 

meta/recipes-devtools/qemu/qemuwrapper-cross_1.0.bb

@@ -2,8 +2,7 @@ SUMMARY = "QEMU wrapper script"
 HOMEPAGE = "http://qemu.org"
 LICENSE = "MIT"
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 DEPENDS += "qemu-native"