Clang enables -Wenum-conversion by default anyway, we add it to CFLAGS to enable them on GCC.
When explicitly enabled, Clang also enables additional warnings. Some of those warnings, like
-Wenum-enum-conversion, are too strict to be practical with win32, so avoid enabling them.

Since wine commit 401288a7 (make_specfiles: Generate a list of
syscalls from the corresponding spec files., 2023-11-16), spec files
are used to auto-generate the following files:

- dlls/ntdll/ntsyscalls.h (from dlls/ntdll/ntdll.spec)
- dlls/win32u/win32syscalls.h (from dlls/win32u/win32u.spec)

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>

Signed-off-by: Nikolay Sivov <nsivov@codeweavers.com>

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=56411

Fix a regression from "bb496ea8 - server: Always queue mouse messages delivered to another window."

Fix ETHER VAPOR Remaster (214570) launches to black screen when the cursor is in the game window.

The game calls ReleaseCapture() when handling WM_MOUSEMOVE. After bb496ea8, WM_MOUSEMOVE is always
queued because the message window is NULL. So ReleaseCapture() ends up queuing another WM_MOUSEMOVE.
So the game ends up handling infinite WM_MOUSEMOVE messages at startup and is not able to do anything.

Fixes a test failure on ARM64EC.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=40613

Rufus 3.13 Portable requires administrator privileges, and uses a manifest to
elevate itself.

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=51000

This prevents log spam in one game.