refactor/fix: Resolve some wmisc issues

> fix crashes around missing call convention/log hook
> enable wmisc for M39 as well, see #8

hooks/sndbhook.cpp

@@ -889,6 +889,7 @@ public:
 } tests_("sndb_test");
 void init(HINSTANCE hmodule, const char *model, const char *ext)
 {
+    if (to_hash(model) != to_hash("LDJ")) return;
     if (false && IsDebuggerPresent())
     {
         log_warning("hooks::soundbank", "Debugger detected, skipping..");

hooks/wmischook.cpp

@@ -9,7 +9,7 @@
 
 namespace hooks::wmisc::msacm
 {
-typedef MMRESULT (*acmFormatSuggest_t)(HANDLE had, LPWAVEFORMATEX pwfxSrc, LPWAVEFORMATEX pwfxDst, DWORD cbwfxDst, DWORD fdwSuggest);
+typedef MMRESULT (__stdcall *acmFormatSuggest_t)(HANDLE had, LPWAVEFORMATEX pwfxSrc, LPWAVEFORMATEX pwfxDst, DWORD cbwfxDst, DWORD fdwSuggest);
 static acmFormatSuggest_t acmFormatSuggest;
 
 static uint64_t hash_waveformatex(const WAVEFORMATEX *pwfx, DWORD fdwSuggest)
@@ -129,7 +129,7 @@ extern "C" void __cdecl on_log_msg(char level, const char *scope, const char *ms
 }
 void attach(HINSTANCE hmodule)
 {
-    BmswLogInit_t BmswLogInit;
+    BmswLogInit_t BmswLogInit = nullptr;
     HMODULE bmsw;
     if ((bmsw = libutils::try_library(MODULE_PATH / "bmsound-wine.dll")))
     {
@@ -161,6 +161,10 @@ void apply_performance_hacks(HINSTANCE hmodule, const char *model, const char *e
         msacm::attach(hmodule);
         bmsound::attach(hmodule);
         break;
+    case to_hash("M39"):
+        msacm::attach(hmodule);
+        bmsound::attach(hmodule);
+        break;
     case to_hash("FORCE"):
         switch (to_hash(ext))
         {