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/launcher/launcher.cpp

@@ -38,10 +38,10 @@
 #include "games/gitadora/gitadora.h"
 #include "games/hpm/hpm.h"
 #include "games/iidx/iidx.h"
+#include "games/iidx/poke.h"
 #ifdef SPICE64
 #include "games/iidx/camera.h"
 #endif
-#include "games/iidx/poke.h"
 #include "games/jb/jb.h"
 #include "games/mga/mga.h"
 #include "games/nost/nost.h"
@@ -1783,7 +1783,7 @@ int main_implementation(int argc, char *argv[]) {
 
         // enable subscreen touch emulation
         if (options[launcher::Options::spice2x_IIDXEmulateSubscreenKeypadTouch].is_active()) {
-            games::iidx::poke::enable();
+            games::iidx::ENABLE_POKE = true;
         }
         if (options[launcher::Options::NostalgiaPoke].is_active()) {
             games::nost::ENABLE_POKE = true;