[wasm][bcl][zoneinfo] Fix local zone info marshaling (#34762)

- Correctly marshal Intl.DateTimeFormat().resolvedOptions().timeZone information

/cc @pranavkm

Thanks for the report and testing Pranav

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Co-authored-by: kjpou1 <[email protected]>

src/mono/mono/metadata/icall-decl.h

@@ -205,7 +205,7 @@ ICALL_EXPORT gint32 ves_icall_System_IO_Compression_DeflateStreamNative_WriteZSt
 #endif
 
 #if defined(TARGET_WASM)
-ICALL_EXPORT void ves_icall_System_TimeZoneInfo_mono_timezone_get_local_name (MonoString result);
+ICALL_EXPORT void ves_icall_System_TimeZoneInfo_mono_timezone_get_local_name (MonoString **result);
 #endif
 
 #if defined(ENABLE_MONODROID)

src/mono/mono/metadata/icall.c

@@ -8213,9 +8213,9 @@ ves_icall_System_IO_Compression_DeflateStreamNative_WriteZStream (gpointer strea
 #endif
 
 #if defined(TARGET_WASM)
-G_EXTERN_C void mono_timezone_get_local_name (MonoString result);
+G_EXTERN_C void mono_timezone_get_local_name (MonoString **result);
 void
-ves_icall_System_TimeZoneInfo_mono_timezone_get_local_name (MonoString result)
+ves_icall_System_TimeZoneInfo_mono_timezone_get_local_name (MonoString **result)
 {
 	// MONO_CROSS_COMPILE returns undefined symbol "_mono_timezone_get_local_name"
 	// The icall offsets will be generated and linked at build time