setup-hooks/strip: more robust stripping

Use "find -exec" to strip rather than "find … | xargs …". The former
ensures that stripping is attempted for each file, whereas the latter
will stop stripping at the first failure. Unstripped files can fool
runtime dependency detection and bloat closure sizes.

pkgs/build-support/setup-hooks/strip.sh

@@ -51,7 +51,7 @@ stripDirs() {
 
     if [ -n "${dirs}" ]; then
         header "stripping (with command $cmd and flags $stripFlags) in$dirs"
-        find $dirs -type f -print0 | xargs -0 ${xargsFlags:--r} $cmd $commonStripFlags $stripFlags 2>/dev/null || true
+        find $dirs -type f -exec $cmd $commonStripFlags $stripFlags '{}' \; #
         stopNest
     fi
 }