Fix more crossplat issues

src/convar.cc

@@ -291,10 +291,11 @@ void ConvarBase::tf_convar_changed(sdk::IConVar *iconvar, const char *old_string
 ConvarBase::ConvarBase(const char *name, ConvarType type, const ConvarBase *parent) : parent(parent), t(type), next(head), init_complete(false) {
     head = this;
 
-    if constexpr (doghook_platform_windows())
+#if doghook_platform_windows()
     strcpy_s(internal_name, name);
-    else if constexpr (doghook_platform_linux())
+#elif doghook_platform_linux()
     strcpy(internal_name, name);
+#endif
 
     // Create a tf convar based on this one
     tf_convar = new sdk::ConCommandBase;

src/convar.hh

@@ -300,7 +300,12 @@ public:
 
         auto size = strlen(str) + 1;
         value     = new char[size];
+
+#if doghook_platform_windows()
         strcpy_s(this->value, size, str);
+#elif doghook_platform_linux()
+        strncpy(this->value, size, str);
+#endif
 
         return false;
     }

src/sdk.hh

@@ -239,6 +239,7 @@ public:
 
     auto get_verified_user_cmd(u32 sequence_number) -> class VerifiedCmd * {
         // 03 B7 ? ? ? ? 8D 04 88
+        return nullptr;
     }
 };