Make binutils optional when elfutils are available

This is intended for minimum host OSes where 36 MB used by binutils
are deemed too expensive. We only need "strip", which exists as eu-strip
in elfutils, which in turn is < 1 MB in size.

Note that the tests (TEST-04-FULL-SYSTEMD/test.sh) still depend on
strip from binutils. It could use sstrip in the future.

dracut.sh

@@ -1605,7 +1605,11 @@ fi
 
 # strip binaries
 if [[ $do_strip = yes ]] ; then
-    for p in strip xargs find; do
+    # Prefer strip from elfutils for package size
+    declare strip_cmd=$(command -v eu-strip)
+    test -z "$strip_cmd" && strip_cmd="strip"
+
+    for p in $strip_cmd xargs find; do
         if ! type -P $p >/dev/null; then
             dinfo "Could not find '$p'. Not stripping the initramfs."
             do_strip=no
@@ -1617,14 +1621,14 @@ if [[ $do_strip = yes ]] && ! [[ $DRACUT_FIPS_MODE ]]; then
     dinfo "*** Stripping files ***"
     find "$initdir" -type f \
         -executable -not -path '*/lib/modules/*.ko' -print0 \
-        | xargs -r -0 strip -g 2>/dev/null
+        | xargs -r -0 $strip_cmd -g 2>/dev/null
 
     # strip kernel modules, but do not touch signed modules
     find "$initdir" -type f -path '*/lib/modules/*.ko' -print0 \
         | while read -r -d $'\0' f || [ -n "$f" ]; do
         SIG=$(tail -c 28 "$f" | tr -d '\000')
         [[ $SIG == '~Module signature appended~' ]] || { printf "%s\000" "$f"; }
-    done | xargs -r -0 strip -g
+    done | xargs -r -0 $strip_cmd -g
 
     dinfo "*** Stripping files done ***"
 fi