Rename *.tif to *.tiff for consistency

There really isn't any practical difference between these two, but repo
currently uses *.tiff files more than 8.3 variant filenames of *.tif.
Also these aren't part of the test.

Author: petk

ext/standard/tests/image/200x100.tif renamed to ext/standard/tests/image/200x100.tiff

@@ -255,7 +255,7 @@ array(16) {
     ["mime"]=>
     string(29) "application/x-shockwave-flash"
   }
-  ["test4pix.tif"]=>
+  ["test4pix.tiff"]=>
   array(5) {
     [0]=>
     int(4)

ext/standard/tests/image/2x2mm.tif renamed to ext/standard/tests/image/2x2mm.tiff

@@ -24,7 +24,7 @@ $imagetype_filenames = array(
       "BMP image file" => "200x100.bmp",
 
       //TIFF intel byte order
-      "TIFF intel byte order image file" => "200x100.tif",
+      "TIFF intel byte order image file" => "200x100.tiff",
 
       //JPC file
       "JPC image file" => "test1pix.jpc",
@@ -143,7 +143,7 @@ array(6) {
 array(0) {
 }
 
--- TIFF intel byte order image file (200x100.tif) --
+-- TIFF intel byte order image file (200x100.tiff) --
 array(5) {
   [0]=>
   int(200)

ext/standard/tests/image/getimagesize.phpt

@@ -9,7 +9,7 @@ GetImageSize() for tiff format with big-endian (aka Motorola, aka MM) ordering
  */
 
 echo "*** Testing getimagesize() : tiff_mm format ***\n";
-var_dump(getimagesize(__DIR__ . "/2x2mm.tif", $arr));
+var_dump(getimagesize(__DIR__ . "/2x2mm.tiff", $arr));
 var_dump($arr);
 
 ?>

ext/standard/tests/image/getimagesize_basic.phpt

@@ -55,6 +55,6 @@ array(16) {
   string(9) "image/psd"
   ["test4pix.swf"]=>
   string(29) "application/x-shockwave-flash"
-  ["test4pix.tif"]=>
+  ["test4pix.tiff"]=>
   string(10) "image/tiff"
 }