Revert "Merge pull request #45 from andypost/master"

This reverts commit 7384d93c, reversing
changes made to fc461097.

fopen behavior changed with PHP 8, but not PSR-17.
Function createStreamFromFile still NOT throw ValueError,
but only RuntimeException or InvalidArgumentException.

test/StreamFactoryTestCase.php

@@ -8,7 +8,6 @@ use RuntimeException;
 use PHPUnit\Framework\TestCase;
 use Psr\Http\Message\StreamFactoryInterface;
 use Psr\Http\Message\StreamInterface;
-use ValueError;
 
 abstract class StreamFactoryTestCase extends TestCase
 {
@@ -92,7 +91,7 @@ abstract class StreamFactoryTestCase extends TestCase
 
     public function testCreateStreamFromInvalidFileName()
     {
-        $this->expectException(PHP_VERSION_ID >= 80000 ? ValueError::class : RuntimeException::class);
+        $this->expectException(RuntimeException::class);
         $stream = $this->factory->createStreamFromFile('');
     }