meta-openembedded/all: adapt to UNPACKDIR changes

Please see
https://git.yoctoproject.org/poky/commit/?id=4dd321f8b83afecd962393101b2a6861275b5265
for what changes are needed, and sed commands that can be used to make them en masse.

I've verified that bitbake -c patch world works with these, but did not run a world
build; the majority of recipes shouldn't need further fixups, but if there are
some that still fall out, they can be fixed in followups.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-multimedia/recipes-multimedia/sample-content/bigbuckbunny-1080p.bb

@@ -9,8 +9,7 @@ SRC_URI[sha256sum] = "69fe2cfe7154a6e752688e3a0d7d6b07b1605bbaf75b56f6470dc7b4c2
 
 inherit allarch
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_install() {
     install -d ${D}${datadir}/movies

meta-multimedia/recipes-multimedia/sample-content/bigbuckbunny-480p.bb

@@ -9,8 +9,7 @@ SRC_URI[sha256sum] = "40d1cf5bc8e1b0e55dac7bb2e3fbc2aea05b6679444864781299b24db0
 
 inherit allarch
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_install() {
     install -d ${D}${datadir}/movies

meta-multimedia/recipes-multimedia/sample-content/bigbuckbunny-720p.bb

@@ -9,8 +9,7 @@ SRC_URI[sha256sum] = "b957d6e6212638441b52d3b620af157cc8d40c2a0342669294854a06ed
 
 inherit allarch
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_install() {
     install -d ${D}${datadir}/movies

meta-multimedia/recipes-multimedia/sample-content/tearsofsteel-1080p.bb

@@ -8,8 +8,7 @@ SRC_URI[sha256sum] = "bd2b5bc6c16d4085034f47ef7e4b3938afe86b4eec4ac3cf2685367d3b
 
 inherit allarch
 
-S = "${WORKDIR}/sources"
-UNPACKDIR = "${S}"
+S = "${UNPACKDIR}"
 
 do_install() {
     install -d ${D}${datadir}/movies