fix duplicated symbols of tiff/libharu

ports/libharu/CONTROL

@@ -1,5 +1,10 @@
 Source: libharu
-Version: 2017-08-15-8
+Version: 2017-08-15-9
 Homepage: https://github.com/libharu/libharu
 Description: libharu - free PDF library
 Build-Depends: zlib, libpng
+Default-Features: notiffsymbols
+
+Feature: notiffsymbols
+Description: disable symbols also defined by the tiff port
+Build-Depends: tiff

ports/libharu/portfile.cmake

@@ -1,5 +1,6 @@
-include(vcpkg_common_functions)
-
+if("notiffsymbols" IN_LIST FEATURES)
+    set(DISABLETIFF tiff.patch)
+endif()
 vcpkg_download_distfile(SHADING_PR
     URLS "https://github.com/libharu/libharu/pull/157.diff"
     FILENAME "libharu-shading-pr-157.patch"
@@ -17,6 +18,7 @@ vcpkg_from_github(
         add-boolean-typedef.patch
         # This patch adds shading support which is required for VTK. If desired, this could be moved into an on-by-default feature.
         ${SHADING_PR}
+        ${DISABLETIFF}
 )
 
 if(VCPKG_LIBRARY_LINKAGE STREQUAL "dynamic")

ports/libharu/tiff.patch

@@ -0,0 +1,12 @@
+diff --git a/src/hpdf_image_ccitt.c b/src/hpdf_image_ccitt.c
+index 2937fc90d..a1a35d0ed 100644
+--- a/src/hpdf_image_ccitt.c
++++ b/src/hpdf_image_ccitt.c
+@@ -21,7 +21,6 @@
+ #include <memory.h>
+ #include <assert.h>
+ 
+-#define	G3CODES
+ #include "t4.h"
+ 
+ typedef unsigned int uint32;