[PATCH] configure: change a typo in zstd config

[Denis Plotnikov <dplotnikov@virtuozzo.com>]

Package manager --exist flag is used instead of --exists.
Fix it.

Signed-off-by: Denis Plotnikov <dplotnikov@virtuozzo.com>
---
 configure | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/configure b/configure
index 7b373bc0bb..caa65f5883 100755
--- a/configure
+++ b/configure
@@ -2464,7 +2464,7 @@ fi
 # zstd check
 
 if test "$zstd" != "no" ; then
-    if $pkg_config --exist libzstd ; then
+    if $pkg_config --exists libzstd ; then
         zstd_cflags="$($pkg_config --cflags libzstd)"
         zstd_libs="$($pkg_config --libs libzstd)"
         LIBS="$zstd_libs $LIBS"
-- 
2.17.0