FindLATEX: Search user-local MiKTeX locations

I've noticed the default installer for MikTex does not prompt for
escalation.  So, many installations I find do not have registry entries.
This should cover finding it in the current defaults.

Modules/FindLATEX.cmake

@@ -61,6 +61,10 @@ if (WIN32)
   # Try to find the MikTex binary path (look for its package manager).
   find_path(MIKTEX_BINARY_PATH mpm.exe
     "[HKEY_LOCAL_MACHINE\\SOFTWARE\\MiK\\MiKTeX\\CurrentVersion\\MiKTeX;Install Root]/miktex/bin"
+     "$ENV{LOCALAPPDATA}/Programs/MiKTeX/miktex/bin"
+     "$ENV{LOCALAPPDATA}/Programs/MiKTeX/miktex/bin/x64"
+     "$ENV{APPDATA}/Programs/MiKTeX/miktex/bin"
+     "$ENV{APPDATA}/Programs/MiKTeX/miktex/bin/x64"
     DOC
     "Path to the MikTex binary directory."
   )