beesh: always set ARCH

we need to always recompute PKGALLPKG after PKGFULLPKG was changed.

src/beesh.sh.in

@@ -788,7 +788,7 @@ function extract_new_package_variables() {
     PKGFULLPKG=${PKGFULLNAME}-${PKGFULLVERSION}-${PKGREVISION}
 
     # since PKGARCH is now known reconstruct PKGALLPKG
-    : ${PKGALLPKG:=${PKGFULLPKG}.${PKGARCH}}
+    PKGALLPKG="${PKGFULLPKG}.${PKGARCH}"
 
     eval $("${BEE_BINDIR}/beeversion" "${PKGALLPKG}")
 }