[icu] Fix path to fallback install-sh

ports/icu/fix-using-install-sh.diff

@@ -0,0 +1,23 @@
+diff --git a/source/configure b/source/configure
+index a6df219..2e1ebcf 100644
+--- a/source/configure
++++ b/source/configure
+@@ -4935,12 +4935,12 @@ test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644'
+
+
+
+-# make sure install is relative to srcdir - if a script
+-if test "$srcdir" = "."; then
+-  # If srcdir isn't just ., then (srcdir) is already prepended.
+-  if test "${ac_install_sh}" = "${INSTALL}"; then
+-   INSTALL="\\\$(top_srcdir)/${ac_install_sh}"
+-  fi
++# If using the included install-sh, make INSTALL work from any build dir.
++if test "${ac_install_sh}" = "${INSTALL}"; then
++    case "$srcdir" in
++        .|./*|../*)  INSTALL="\\\$(top_builddir)/${ac_install_sh}" ;;
++        *) ;;
++    esac
+ fi
+
+ # TODO(ICU-20301): Remove fallback to Python 2.

ports/icu/portfile.cmake

@@ -12,6 +12,7 @@ vcpkg_extract_source_archive(SOURCE_PATH
         fix_bsd_and_solaris.patch
         fix_parallel_build_on_windows.patch
         fix-python-path-with-spaces.patch
+        fix-using-install-sh.diff
         mh-darwin.patch
         mh-mingw.patch
         mh-msys-msvc.patch

ports/icu/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "icu",
   "version": "78.3",
-  "port-version": 1,
+  "port-version": 2,
   "description": "Mature and widely used Unicode and localization library.",
   "homepage": "https://icu.unicode.org/home",
   "license": "ICU",

versions/baseline.json

@@ -3942,7 +3942,7 @@
     },
     "icu": {
       "baseline": "78.3",
-      "port-version": 1
+      "port-version": 2
     },
     "ideep": {
       "baseline": "2026-05-11",

versions/i-/icu.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "da9f6dddd34300c1eea72aadde1d774ce2d3f31c",
+      "version": "78.3",
+      "port-version": 2
+    },
     {
       "git-tree": "931a42f3b3b911ba73dbbaead4c1e0037a158efd",
       "version": "78.3",