The find script for asio sdk failed on multiple inclusion (#26583)

Since it first tries to locate the directory and then unconditionally
adds a subdirectory to it, running this script twice resulted in an
incorrect path (the last node was added multiple times).

We now check whether the script already ran and then abort.

Co-authored-by: Martijn Otto <martijn@resolume.com>

ports/asiosdk/Findasiosdk.cmake

@@ -3,6 +3,13 @@ else(WIN32)
   message(FATAL_ERROR "Findasiosdk.cmake: Unsupported platform ${CMAKE_SYSTEM_NAME}" )
 endif(WIN32)
 
+# if this script is invoked multiple times, we end up adding
+# "asiosdk" to the directory multiple times, leading to incorrect
+# include paths
+if (ASIOSDK_ROOT_DIR)
+    return()
+endif()
+
 find_path(
   ASIOSDK_ROOT_DIR
   asiosdk

ports/asiosdk/vcpkg.json

@@ -1,7 +1,7 @@
 {
   "name": "asiosdk",
   "version": "2.3.3",
-  "port-version": 4,
+  "port-version": 5,
   "description": "ASIO is a low latency audio API from Steinberg.",
   "homepage": "https://www.steinberg.net/en/company/developers.html",
   "supports": "windows & !(arm | uwp)"

versions/a-/asiosdk.json

@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "75f1c1ef95024543bf7298ba4389eafe67b9f473",
+      "version": "2.3.3",
+      "port-version": 5
+    },
     {
       "git-tree": "101bbdad9205db5b4249eae8b47bf8c5f73493a8",
       "version": "2.3.3",

versions/baseline.json

@@ -198,7 +198,7 @@
     },
     "asiosdk": {
       "baseline": "2.3.3",
-      "port-version": 4
+      "port-version": 5
     },
     "asmjit": {
       "baseline": "2021-10-26",