touch: restore wintouchemu, fall back to it when native touch hooks fail (#834)

## Link to GitHub Issue or related Pull Request, if one exists
Fixes #833

## Description of change
Last couple PRs - such as #820 #827 #828 - made the native touch hook &
touch injection using `InjectTouchInput` the default path, since it
performs much more reliably with both real touch screens and mouse (or
any other synthetic source).

However, user has reported that WINE lacks `InjectTouchInput` which
means this won't work.

As a fix, revive the old wintouchemu code. Native touch is still the
default, but under following circumstances:

1. if `-touchemuforce` is set, or
2. if any of the required Windows touch APIs are unavailable

then we fail over from native touch to wintouchemu code. 

For Linux, condition #2 would be hit during init, and gracefully switch
over.

Caveat: the poke code for IIDX and Nost will continue to require native
touch, I do not want to maintain two paths for this. This means that
iidx poke will stop working on Linux, unfortunately.

## Testing
Tested on Windows with `-touchemuforce` set. This is mostly reverting
Linux code path back to where we were last release, so this should just
work with wine.

src/spice2x/touch/native/nativetouchhook.cpp

@@ -223,25 +223,58 @@ namespace nativetouch {
         }
     }
 
-    void hook(HMODULE module) {
+    static bool hook_prerequisites_available(HMODULE module) {
+        if (detour::iat_find("GetTouchInputInfo", module) == nullptr) {
+            log_warning("touch::native", "GetTouchInputInfo unavailable");
+            return false;
+        }
+        if (settings::EMULATE_DIGITIZER &&
+            detour::iat_find("GetSystemMetrics", module) == nullptr) {
+            log_warning("touch::native", "GetSystemMetrics unavailable");
+            return false;
+        }
+        return true;
+    }
+
+    bool hook(HMODULE module) {
+        native_touch_hooked = false;
         initialize_game_settings();
 
-        inject::hook(module);
+        // check if the OS supports touch API (Win7+) and injection API (requires Win8+)
+        if (!hook_prerequisites_available(module)) {
+            return false;
+        }
+        if (!inject::hook_available(module)) {
+            return false;
+        }
 
-        native_touch_hooked = true;
+        // try hooking injection API first since they require the highest OS level
+        // (WINE specifically did not implement this in 2026)
+        if (!inject::hook(module)) {
+            return false;
+        }
 
+        // GetSystemMetrics
         if (settings::EMULATE_DIGITIZER) {
             GetSystemMetrics_orig = detour::iat_try(
                 "GetSystemMetrics", GetSystemMetricsHook, module);
-            if (GetSystemMetrics_orig != nullptr) {
-                log_misc("touch::native", "GetSystemMetrics hooked");
+            if (GetSystemMetrics_orig == nullptr) {
+                log_warning("touch::native", "failed to hook GetSystemMetrics");
+                return false;
             }
+            log_misc("touch::native", "GetSystemMetrics hooked");
         }
 
+        // GetTouchInputInfo
         GetTouchInputInfo_orig = detour::iat_try("GetTouchInputInfo", GetTouchInputInfoHook, module);
-        if (GetTouchInputInfo_orig != nullptr) {
-            log_misc("touch::native", "GetTouchInputInfo hooked");
+        if (GetTouchInputInfo_orig == nullptr) {
+            log_warning("touch::native", "failed to hook GetTouchInputInfo");
+            return false;
         }
+        log_misc("touch::native", "GetTouchInputInfo hooked");
+        
+        native_touch_hooked = true;
+        return true;
     }
 
 }