[exiv2] Fix FindIconv

ports/exiv2/CONTROL

@@ -1,4 +1,4 @@
 Source: exiv2
-Version: 8f5b795eaa4bc414d2d6041c1dbd1a7f7bf1fc99-1
+Version: 8f5b795eaa4bc414d2d6041c1dbd1a7f7bf1fc99-2
-Build-Depends: zlib, expat
+Build-Depends: zlib, expat, libiconv
 Description: Image metadata library and tools http://www.exiv2.org

ports/exiv2/portfile.cmake

@@ -13,6 +13,11 @@ vcpkg_configure_cmake(
     PREFER_NINJA
 )
 
+vcpkg_apply_patches(
+    SOURCE_PATH "${SOURCE_PATH}"
+    PATCHES "${CMAKE_CURRENT_LIST_DIR}/use-iconv.patch"
+)
+
 vcpkg_install_cmake()
 
 vcpkg_fixup_cmake_targets(CONFIG_PATH "share/exiv2/cmake")

ports/exiv2/use-iconv.patch

@@ -0,0 +1,37 @@
+diff --git a/config/FindIconv.cmake b/config/FindIconv.cmake
+index 15a0e39..53718bf 100644
+--- a/config/FindIconv.cmake
++++ b/config/FindIconv.cmake
+@@ -36,12 +36,13 @@ if(NOT ICONV_INCLUDE_DIR STREQUAL "ICONV_INCLUDE_DIR-NOTFOUND")
+ endif()
+ 
+ if(NOT ICONV_IN_GLIBC)
+-    find_library(ICONV_LIBRARY NAMES iconv)
++    find_library(ICONV_LIBRARY NAMES iconv libiconv)
+     set(ICONV_TEST ${ICONV_LIBRARY})
+ else()
+     set(ICONV_TEST "In glibc")
+ endif()
+ 
++set(CMAKE_REQUIRED_INCLUDES ${ICONV_INCLUDE_DIR})
+ set(CMAKE_REQUIRED_LIBRARIES ${ICONV_LIBRARY})
+ check_cxx_source_compiles(
+     "#include <iconv.h>
+@@ -59,7 +60,8 @@ else(ICONV_FOUND)
+   set(ICONV_LIBRARIES)
+ endif(ICONV_FOUND)
+ 
+-if(ICONV_FOUND)  
++if(ICONV_FOUND)
++    set(CMAKE_REQUIRED_INCLUDES ${ICONV_INCLUDE_DIR})
+     set(CMAKE_REQUIRED_LIBRARIES ${ICONV_LIBRARIES})
+     check_cxx_source_compiles(
+         "#include <iconv.h>
+@@ -69,6 +71,7 @@ if(ICONV_FOUND)
+          }"
+         ICONV_ACCEPTS_NONCONST_INPUT)
+ 
++    set(CMAKE_REQUIRED_INCLUDES ${ICONV_INCLUDE_DIR})
+     set(CMAKE_REQUIRED_LIBRARIES ${ICONV_LIBRARIES})
+     check_cxx_source_compiles(
+         "#include <iconv.h>