common: merge only_for_archs and noarch=yes into one.

* noarch=yes is replaced with archs=noarch
* only_for_archs= is renamed to archs=
* archs= allows the use of wildcards and negations; first matching rule applies:
  * archs="*-musl" will build the pkg only for musl-libcs
  * archs="~*-musl" will build the pkg only on non-musl-libc
  * archs="x86_64-musl ~*-musl" will build for x86_64-musl and any non-musl
    arch.
* archs= defaults to "*"

common/hooks/pre-pkg/04-generate-runtime-deps.sh

@@ -56,7 +56,7 @@ hook() {
 
     mapshlibs=$XBPS_COMMONDIR/shlibs
 
-    if [ -n "$noarch" -o -n "$noverifyrdeps" ]; then
+    if [ "${archs// /}" = "noarch" -o -n "$noverifyrdeps" ]; then
         store_pkgdestdir_rundeps
         return 0
     fi