[wasm][5.7] rename duplicated symbol _swift_stdlib_getScriptExtensions

Ideally,
swiftlang/swift-experimental-string-processing#500
should be ported to 5.7 branch, but we don't control it, so...

Author: kateinoigakukun

stdlib/public/SwiftShims/UnicodeData.h

@@ -111,7 +111,7 @@ SWIFT_RUNTIME_STDLIB_INTERNAL
 __swift_uint8_t _swift_stdlib_getScript(__swift_uint32_t scalar);
 
 SWIFT_RUNTIME_STDLIB_INTERNAL
-const __swift_uint8_t *_swift_stdlib_getScriptExtensions(
+const __swift_uint8_t *_swiftCore_stdlib_getScriptExtensions(
                                                         __swift_uint32_t scalar,
                                                         __swift_uint8_t *count);
 

stdlib/public/core/UnicodeSPI.swift

@@ -145,7 +145,7 @@ extension Unicode.Scalar.Properties {
   @available(SwiftStdlib 5.7, *)
   public var _scriptExtensions: [UInt8] {
     var count: UInt8 = 0
-    let pointer = _swift_stdlib_getScriptExtensions(_scalar.value, &count)
+    let pointer = _swiftCore_stdlib_getScriptExtensions(_scalar.value, &count)
 
     guard let pointer = pointer else {
       return [_script]

stdlib/public/stubs/Unicode/UnicodeScalarProps.cpp

@@ -490,7 +490,7 @@ __swift_uint8_t _swift_stdlib_getScript(__swift_uint32_t scalar) {
 }
 
 SWIFT_RUNTIME_STDLIB_INTERNAL
-const __swift_uint8_t *_swift_stdlib_getScriptExtensions(__swift_uint32_t scalar,
+const __swift_uint8_t *_swiftCore_stdlib_getScriptExtensions(__swift_uint32_t scalar,
                                                        __swift_uint8_t *count) {
 #if !SWIFT_STDLIB_ENABLE_UNICODE_DATA
   swift::swift_abortDisabledUnicodeSupport();