kobo cheats death again (+1 squashed commits)

Squashed commits:

[708e2429] kobo cheats death again

src/llama-mmap.cpp

@@ -374,6 +374,7 @@ struct llama_mmap::impl {
             throw std::runtime_error(format("MapViewOfFile failed: %s", llama_format_win_err(error).c_str()));
         }
 
+#ifndef USE_FAILSAFE
         if (prefetch > 0) {
 #if _WIN32_WINNT >= 0x602
             BOOL (WINAPI *pPrefetchVirtualMemory) (HANDLE, ULONG_PTR, PWIN32_MEMORY_RANGE_ENTRY, ULONG);
@@ -394,6 +395,9 @@ struct llama_mmap::impl {
             throw std::runtime_error("PrefetchVirtualMemory unavailable");
 #endif
         }
+#else
+printf("\nPrefetchVirtualMemory skipped in compatibility mode.\n");
+#endif
     }
 
     void unmap_fragment(size_t first, size_t last) {