xbps-src: replace basename(1) with ${var##*/}.

Reduce number of fork+exec due to using a subshell to execute basename(1).

common/xbps-src/shutils/common.sh

@@ -182,7 +182,7 @@ run_pkg_hooks() {
     eval unset -f hook
     for f in ${XBPS_COMMONDIR}/hooks/${phase}/*.sh; do
         [ ! -r $f ] && continue
-        hookn=$(basename $f)
+        hookn=${f##*/}
         hookn=${hookn%.sh}
         . $f
         run_func hook "$phase hook: $hookn" ${phase}_${hookn}