[CMake] Specify stdlib version for PlayStation port

https://bugs.webkit.org/show_bug.cgi?id=264630

Reviewed by Basuke Suzuki.

Set the stdlib version if the CXX compiler supports the flag.

Remove an unnecessary include, its already in `WebKitCommon.cmake`,
while we're in this file.

* Source/cmake/OptionsPlayStation.cmake:

Canonical link: https://commits.webkit.org/270674@main

Source/cmake/OptionsPlayStation.cmake

@@ -1,7 +1,5 @@
 set(PORT PlayStation)
 
-include(CheckSymbolExists)
-
 string(APPEND CMAKE_C_FLAGS_RELEASE " -g")
 string(APPEND CMAKE_CXX_FLAGS_RELEASE " -g")
 set(CMAKE_CONFIGURATION_TYPES "Debug" "Release")
@@ -22,6 +20,9 @@ WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-Wno-dll-attribute-on-redeclaration)
 # other code then assumes we have things like std::u8string which we do not.
 WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-Wno-builtin-macro-redefined)
 
+# Set the standard libary version
+WEBKIT_PREPEND_GLOBAL_COMPILER_FLAGS(-sce-stdlib=v1)
+
 set(ENABLE_WEBKIT_LEGACY OFF)
 set(ENABLE_WEBINSPECTORUI OFF)