Scripts: Ignore warnings from xz.

In practice this means making the scripts work when
the input files have an unsupported check type which
isn't a problem in practice unless support for
some check types has been disabled at build time.

src/scripts/xzdiff.in

@@ -65,8 +65,9 @@ for file; do
   test "X$file" = X- || <"$file" || exit 2
 done
 
-xz1=$xz
-xz2=$xz
+# xz needs -qQ to ignore warnings like unsupported check type.
+xz1="$xz -qQ"
+xz2="$xz -qQ"
 xz_status=0
 exec 3>&1
 

src/scripts/xzgrep.in

@@ -180,7 +180,7 @@ for i; do
     *[-.]bz2 | *[-.]tbz | *.tbz2) uncompress="bzip2 -cdf";;
     *[-.]lzo | *[-.]tzo) uncompress="lzop -cdf";;
     *[-.]zst | *[-.]tzst) uncompress="zstd -cdfq";; # zstd needs -q.
-    *) uncompress="$xz -cdf";;
+    *) uncompress="$xz -cdfqQ";; # -qQ to ignore warnings like unsupp. check.
   esac
   # xz_status will hold the decompressor's exit status.
   # Exit status of grep (and in rare cases, printf or sed) is

src/scripts/xzless.in

@@ -50,9 +50,9 @@ fi
 if test "$(less -V | { read _ ver _ && echo ${ver%%.*}; })" -ge 429; then
 	# less 429 or later: LESSOPEN pipe will be used on
 	# standard input if $LESSOPEN begins with |-.
-	LESSOPEN="|-$xz -cdfq -- %s"
+	LESSOPEN="|-$xz -cdfqQ -- %s"
 else
-	LESSOPEN="|$xz -cdfq -- %s"
+	LESSOPEN="|$xz -cdfqQ -- %s"
 fi
 export LESSMETACHARS LESSOPEN
 

src/scripts/xzmore.in

@@ -52,7 +52,7 @@ if test $# = 0; then
 	if test -t 0; then
 		printf '%s\n' "$usage"; exit 1
 	else
-		$xz -cdfq | eval "${PAGER:-more}"
+		$xz -cdfqQ | eval "${PAGER:-more}"
 	fi
 else
 	FIRST=1
@@ -70,7 +70,7 @@ else
 		fi
 		if test "$ANS" != 's'; then
 			printf '%s\n' "------> $FILE <------"
-			$xz -cdfq -- "$FILE" | eval "${PAGER:-more}"
+			$xz -cdfqQ -- "$FILE" | eval "${PAGER:-more}"
 		fi
 		if test -t 1; then
 			FIRST=0