Remove BOM in linesToHash, partial fix for FS#2464

The BOM at the beginning of some plugin.info.txt files prevented the
plugin manager from correctly reading the base property and thus it
installed the plugin in the wrong directory.

inc/confutils.php

@@ -143,6 +143,9 @@ function getSchemes() {
  */
 function linesToHash($lines, $lower=false) {
     $conf = array();
+    // remove BOM
+    if (isset($lines[0]) && substr($lines[0],0,3) == pack('CCC',0xef,0xbb,0xbf))
+        $lines[0] = substr($lines[0],3);
     foreach ( $lines as $line ) {
         //ignore comments (except escaped ones)
         $line = preg_replace('/(?<![&\\\\])#.*$/','',$line);