libtiff: drop obsolete patch

it has been fixed upstream

Change-Id: I7a23ae5271653db026c479a7f3771ca06e2f4425
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/207669
Reviewed-by: Xisco Fauli <xiscofauli@libreoffice.org>
Tested-by: Jenkins

external/libtiff/UnpackedTarball_libtiff.mk

@@ -14,7 +14,6 @@ $(eval $(call gb_UnpackedTarball_set_tarball,libtiff,$(LIBTIFF_TARBALL)))
 $(eval $(call gb_UnpackedTarball_add_patches,libtiff,\
     external/libtiff/libtiff.linknolibs.patch \
     external/libtiff/0001-ofz-54685-Timeout.patch \
-    external/libtiff/ofz68840.patch \
 ))
 
 # vim: set noet sw=4 ts=4:

external/libtiff/ofz68840.patch

@@ -1,20 +0,0 @@
---- a/libtiff/tif_strip.c
-+++ b/libtiff/tif_strip.c
-@@ -159,10 +159,13 @@
-             _TIFFMultiply64(tif, samplingrow_size, samplingblocks_ver, module));
-     }
-     else
--        return (_TIFFMultiply64(tif, nrows,
--                                isStrip ? TIFFScanlineSize64(tif)
--                                        : TIFFTileRowSize64(tif),
--                                module));
-+    {
-+        uint64_t row_size = isStrip ? TIFFScanlineSize64(tif) : TIFFTileRowSize64(tif);
-+        /* I think the way this works the expectation is there are always even num of samples */
-+        if (td->td_photometric == PHOTOMETRIC_YCBCR)
-+            row_size = TIFFroundup_64(row_size, 2);
-+        return (_TIFFMultiply64(tif, nrows, row_size, module));
-+    }
- }
- 
- /*