Fixing argon on Xenial

Author: cesar-cs

bin/install-password-argon2

@@ -9,7 +9,13 @@ if [[ ! $VERSION =~ ^master$ ]] && [[ "$(printf "7.2\n$VERSION" | sort -V | head
 	exit 0
 fi
 
-LIBARGON2_INSTALL_DIR=$HOME/.phpenv/versions/$VERSION
+
+if [[ $VERSION =~ ^8.1 ]]; then
+	LIBARGON2_INSTALL_DIR=/usr
+else
+	LIBARGON2_INSTALL_DIR=$HOME/.phpenv/versions/$VERSION
+fi
+
 
 git clone https://github.com/P-H-C/phc-winner-argon2.git libargon2