[libssh2] Fix use with cmake < 3.18

ports/libssh2/cmake-config.diff

@@ -0,0 +1,27 @@
+diff --git a/cmake/libssh2-config.cmake.in b/cmake/libssh2-config.cmake.in
+index edc86d7..fd53d55 100644
+--- a/cmake/libssh2-config.cmake.in
++++ b/cmake/libssh2-config.cmake.in
+@@ -22,10 +22,22 @@ include("${CMAKE_CURRENT_LIST_DIR}/@[email protected]")
+
+ # Alias for either shared or static library
+ if(NOT TARGET @PROJECT_NAME@::@LIB_NAME@)
++ if(CMAKE_VERSION VERSION_LESS "3.18.0")
++  # cannot add alias to non-global imported library
++  add_library(@PROJECT_NAME@::@LIB_NAME@ INTERFACE IMPORTED)
++  set_target_properties(@PROJECT_NAME@::@LIB_NAME@ PROPERTIES INTERFACE_LINK_LIBRARIES @PROJECT_NAME@::@LIB_SELECTED@)
++ else()
+   add_library(@PROJECT_NAME@::@LIB_NAME@ ALIAS @PROJECT_NAME@::@LIB_SELECTED@)
++ endif()
+ endif()
+
+ # Compatibility alias
+ if(NOT TARGET Libssh2::@LIB_NAME@)
++ if(CMAKE_VERSION VERSION_LESS "3.18.0")
++  # cannot add alias to non-global imported library
++  add_library(Libssh2::@LIB_NAME@ INTERFACE IMPORTED)
++  set_target_properties(Libssh2::@LIB_NAME@ PROPERTIES INTERFACE_LINK_LIBRARIES @PROJECT_NAME@::@LIB_SELECTED@)
++ else()
+   add_library(Libssh2::@LIB_NAME@ ALIAS @PROJECT_NAME@::@LIB_SELECTED@)
++ endif()
+ endif()

ports/libssh2/portfile.cmake

@@ -5,6 +5,7 @@ vcpkg_from_github(
     SHA512 616efcd7f5c1fb1046104ebce70549e4756e2a55150efa2df5bb7123051d3bf336023cedcbfe932cd7c690a0b4d1f1a93c760ea39f1dba50c2b06d0945dca958
     HEAD_REF master
     PATCHES
+        cmake-config.diff
         pkgconfig.diff
 )
 
@@ -24,11 +25,11 @@ if(VCPKG_LIBRARY_LINKAGE STREQUAL "dynamic")
 endif()
 
 vcpkg_find_acquire_program(PKGCONFIG)
+set(ENV{PKG_CONFIG} "${PKGCONFIG}")
 
 vcpkg_cmake_configure(
     SOURCE_PATH "${SOURCE_PATH}"
     OPTIONS
-        "-DPKG_CONFIG_EXECUTABLE=${PKGCONFIG}"
         -DBUILD_EXAMPLES=OFF
         -DBUILD_TESTING=OFF
         -DENABLE_DEBUG_LOGGING=OFF

ports/libssh2/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "libssh2",
   "version": "1.11.1",
-  "port-version": 1,
+  "port-version": 2,
   "description": "libssh2 is a client-side C library implementing the SSH2 protocol.",
   "homepage": "https://www.libssh2.org",
   "license": "BSD-3-Clause",

versions/baseline.json

@@ -5562,7 +5562,7 @@
     },
     "libssh2": {
       "baseline": "1.11.1",
-      "port-version": 1
+      "port-version": 2
     },
     "libstemmer": {
       "baseline": "2021.2.2.0",

versions/l-/libssh2.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "6c7dcac34e292ddbac4c17716d218f35606c65a6",
+      "version": "1.11.1",
+      "port-version": 2
+    },
     {
       "git-tree": "01783f68b91820c8270fe759f595b5562fb55a7c",
       "version": "1.11.1",