Bugfix: release Win16Lock in WinExec16, CallProc[Ex]32W_16.

diff --git a/loader/module.c b/loader/module.c
index ebbceac..3f3b6e5 100644
--- a/loader/module.c
+++ b/loader/module.c
@@ -805,7 +805,13 @@
  */
 HINSTANCE16 WINAPI WinExec16( LPCSTR lpCmdLine, UINT16 nCmdShow )
 {
-    return WinExec( lpCmdLine, nCmdShow );
+    HINSTANCE16 hInst;
+
+    SYSLEVEL_ReleaseWin16Lock();
+    hInst = WinExec( lpCmdLine, nCmdShow );
+    SYSLEVEL_RestoreWin16Lock();
+
+    return hInst;
 }
 
 /***********************************************************************