Update deprecated use of preg_match*() flags

lessc.inc.php

@@ -3605,7 +3605,7 @@ protected function match($regex, &$out, $eatWhitespace = null) {
  if ($eatWhitespace === null) $eatWhitespace = $this->eatWhiteDefault;
 
  $r = '/'.$regex.($eatWhitespace && !$this->writeComments ? '\s*' : '').'/Ais';
- if (preg_match($r, $this->buffer, $out, null, $this->count)) {
+ if (preg_match($r, $this->buffer, $out, 0, $this->count)) {
  $this->count += strlen($out[0]);
  if ($eatWhitespace && $this->writeComments) $this->whitespace();
  return true;
@@ -3617,7 +3617,7 @@ protected function match($regex, &$out, $eatWhitespace = null) {
  protected function whitespace() {
  if ($this->writeComments) {
  $gotWhite = false;
- while (preg_match(self::$whitePattern, $this->buffer, $m, null, $this->count)) {
+ while (preg_match(self::$whitePattern, $this->buffer, $m, 0, $this->count)) {
  if (isset($m[1]) && empty($this->seenComments[$this->count])) {
  $this->append(array("comment", $m[1]));
  $this->seenComments[$this->count] = true;
@@ -3636,7 +3636,7 @@ protected function whitespace() {
  protected function peek($regex, &$out = null, $from=null) {
  if (is_null($from)) $from = $this->count;
  $r = '/'.$regex.'/Ais';
- $result = preg_match($r, $this->buffer, $out, null, $from);
+ $result = preg_match($r, $this->buffer, $out, 0, $from);
 
  return $result;
  }

lessify.inc.php

@@ -43,7 +43,7 @@ public function preg_quote($what) {
 
  public function match($regex, &$out, $eatWhitespace = true) {
  $r = '/'.$regex.($eatWhitespace ? '\s*' : '').'/Ais';
- if (preg_match($r, $this->buffer, $out, null, $this->count)) {
+ if (preg_match($r, $this->buffer, $out, 0, $this->count)) {
  $this->count += strlen($out[0]);
  return true;
  }