[cmake] add find_host_library into iOS toolchain file (cocos2d#19230)

Author: drelaptop

cmake/ios.toolchain.cmake

@@ -203,4 +203,13 @@ macro(find_host_package)
     set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM ONLY)
     set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
     set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
-endmacro(find_host_package)
+endmacro(find_host_package)
+
+# This macro lets you find library on the host system
+macro(find_host_library)
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY NEVER)
+
+    find_library(${ARGN})
+
+    set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
+endmacro(find_host_library)