Fix build.php for Linux

build.php

@@ -50,7 +50,7 @@ function build_for_platform($platform) {
 	$command .= "cp -R src/{*.js,*.html,*.css,fonts,images} build/{$platform}/; ";
 	$command .= "cp -R src/platform/{$platform}/* build/{$platform}/";
 
-	`{$command}`;
+	`bash -c "{$command}"`;
 }
 
-?>
+?>