[openwrt/openwrt] scripts/download.pl: silence can't exec curl warning

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch openwrt-21.02:
https://git.openwrt.org/f14d7cef7cce3ce79b880f71b25e03e5fb844882

commit f14d7cef7cce3ce79b880f71b25e03e5fb844882
Author: Petr Štetiar <ynezz at true.cz>
AuthorDate: Tue Sep 13 07:38:10 2022 +0200

    scripts/download.pl: silence can't exec curl warning
    
    When running build in verbose mode `make V=s` we can see a lot of
    following warnings when curl is not available in the system:
    
     Can't exec "curl": No such file or directory at scripts/download.pl line 77.
    
    So lets fix it by redirecting of the stderr to null hole.
    
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
    (cherry picked from commit c836ca84e8f641e10a8349a8f9b7432b33d6cec1)
---
 scripts/download.pl | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/download.pl b/scripts/download.pl
index 99708c456f..16f808da09 100755
--- a/scripts/download.pl
+++ b/scripts/download.pl
@@ -76,7 +76,7 @@ sub download_cmd($) {
 	my $url = shift;
 	my $have_curl = 0;
 
-	if (open CURL, '-|', 'curl', '--version') {
+	if (open CURL, "curl --version 2>/dev/null |") {
 		if (defined(my $line = readline CURL)) {
 			$have_curl = 1 if $line =~ /^curl /;
 		}