fix for uwp builds

ports/libiconv/0003-Fix-uwp.patch

@@ -0,0 +1,25 @@
+diff --git a/libcharset/lib/localcharset.c b/libcharset/lib/localcharset.c
+index 3aceb42..dadd95a 100644
+--- a/libcharset/lib/localcharset.c
++++ b/libcharset/lib/localcharset.c
+@@ -455,7 +455,10 @@ locale_charset (void)
+ # endif
+ 
+ #elif defined WIN32_NATIVE
+-
++#if defined(WINAPI_FAMILY) && (WINAPI_FAMILY != WINAPI_FAMILY_DESKTOP_APP)
++  // GetACP() not available to UWP apps
++  codeset = NULL;
++#else
+   static char buf[2 + 10 + 1];
+ 
+   /* Woe32 has a function returning the locale's codepage as a number:
+@@ -467,7 +470,7 @@ locale_charset (void)
+      encoding is the best bet.  */
+   sprintf (buf, "CP%u", GetACP ());
+   codeset = buf;
+-
++#endif
+ #elif defined OS2
+ 
+   const char *locale;

ports/libiconv/CMakeLists.txt

@@ -55,6 +55,8 @@ list(APPEND Libiconv_headers ${Libiconv_BINARY_DIR}/localcharset.h)
 #
 set(libname libiconv)
 
+add_definitions(-D_CRT_SECURE_NO_WARNINGS)
+
 configure_file(
   ${Libiconv_SOURCE_DIR}/include/iconv.h.build.in
   ${Libiconv_BINARY_DIR}/iconv.h

ports/libiconv/portfile.cmake

@@ -14,6 +14,7 @@ vcpkg_apply_patches(
     SOURCE_PATH ${SOURCE_PATH}
     PATCHES ${CMAKE_CURRENT_LIST_DIR}/0001-Add-export-definitions.patch
             ${CMAKE_CURRENT_LIST_DIR}/0002-Config-for-MSVC.patch
+            ${CMAKE_CURRENT_LIST_DIR}/0003-Fix-uwp.patch
 )
 
 vcpkg_configure_cmake(