shell32: Implement GUIDFromStringW.

dlls/shell32/shell32.spec

@@ -253,6 +253,8 @@
  660 stdcall -noname FileIconInit(long)
  680 stdcall -noname IsUserAdmin()
 
+ 704 stdcall -noname GUIDFromStringW(wstr ptr)
+
  714 stdcall @(ptr) SHELL32_714 # PathIsTemporaryW
  730 stdcall -noname RestartDialogEx(long wstr long long)
 

dlls/shell32/shellord.c

@@ -33,6 +33,7 @@
 #include "winreg.h"
 #include "wine/debug.h"
 #include "winnls.h"
+#include "winternl.h"
 
 #include "shellapi.h"
 #include "objbase.h"
@@ -1528,6 +1529,17 @@ BOOL WINAPI shell32_243(DWORD a, DWORD b)
 }
 
 /*************************************************************************
+ *      GUIDFromStringW   [SHELL32.704]
+ */
+BOOL WINAPI GUIDFromStringW(LPCWSTR str, LPGUID guid)
+{
+    UNICODE_STRING guid_str;
+
+    RtlInitUnicodeString(&guid_str, str);
+    return !RtlGUIDFromString(&guid_str, guid);
+}
+
+/*************************************************************************
  *      @	[SHELL32.714]
  */
 DWORD WINAPI SHELL32_714(LPVOID x)