fix unbound variable issue

build-package.sh

@@ -801,7 +801,7 @@ termux_step_configure_autotools () {
         fi
 	QUIET_BUILD=
 	if [ ! -z ${TERMUX_QUIET_BUILD+x} ]; then
-		QUIET_BUILD="--enable-silent-rules --silent"
+		QUIET_BUILD="--enable-silent-rules --silent --quiet"
 	fi
 
 	# Some packages provides a $PKG-config script which some configure scripts pickup instead of pkg-config:
@@ -939,6 +939,7 @@ termux_step_post_configure () {
 }
 
 termux_step_make() {
+	QUIET_BUILD=
 	if [ ! -z ${TERMUX_QUIET_BUILD+x} ]; then
 		QUIET_BUILD="-s"
 	fi