Coding Standards: Fix instances of WordPress.PHP.NoSilencedErrors.Discouraged.

Noteable changes:
- The `magic_quotes_runtime` and `magic_quotes_sybase` settings were removed in PHP 5.4, so no longer need to be set.
- Some functions that use external libraries can generate errors that can't be tested for, so are globally allowed to silence errors.
- Quite a few functions would cause errors if `safe_mode` was set. This setting was removed in PHP 5.4.
- Only a handful of `header()` calls needed corresponding `headers_sent()` checks for unit tests to pass, but more may need to be added as the nightlies builds are tested.

See #46732.


git-svn-id: https://develop.svn.wordpress.org/trunk@45611 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/class-wp-dependency.php

@@ -89,7 +89,7 @@ class _WP_Dependency {
 	 * @since 2.6.0
 	 */
 	public function __construct() {
-		@list( $this->handle, $this->src, $this->deps, $this->ver, $this->args ) = func_get_args();
+		list( $this->handle, $this->src, $this->deps, $this->ver, $this->args ) = func_get_args();
 		if ( ! is_array( $this->deps ) ) {
 			$this->deps = array();
 		}