kernel32: Add SetTermsrvAppInstallMode stub.

dlls/kernel32/kernel32.spec

@@ -1024,7 +1024,7 @@
 @ stdcall SetSystemTimeAdjustment(long long)
 @ stdcall SetTapeParameters(ptr long ptr)
 @ stdcall SetTapePosition(ptr long long long long long)
-@ stub SetTermsrvAppInstallMode
+@ stdcall SetTermsrvAppInstallMode(long)
 @ stdcall SetThreadAffinityMask(long long)
 @ stdcall SetThreadContext(long ptr)
 @ stdcall SetThreadExecutionState(long)

dlls/kernel32/version.c

@@ -374,3 +374,19 @@ BOOL WINAPI TermsrvAppInstallMode(void)
     FIXME("stub\n");
     return FALSE;
 }
+
+/***********************************************************************
+ *           SetTermsrvAppInstallMode       (KERNEL32.@)
+ *
+ * This function is said to switch between the INSTALL (TRUE) or
+ * EXECUTE (FALSE) terminal server modes.
+ *
+ * This function always returns zero on WinXP Home so it's probably
+ * safe to return that value in most cases. However, if a terminal
+ * server is running it will probably return something else.
+ */
+DWORD WINAPI SetTermsrvAppInstallMode(BOOL bInstallMode)
+{
+    FIXME("(%d): stub\n", bInstallMode);
+    return 0;
+}