launcher: better DLL logging and remove ucrt hack (#919)

## Link to GitHub Issue or related Pull Request, if one exists
n/a

## Description of change
Remove workaround implemented in #264 that added an ugly hack to work
around DLL hooks that rely on spice using MSVCRT (failure to obtain
argc/argv).

Update the logic that prints info about DLL overrides so that it tries
to print out as much info as possible, instead of bailing out early if
something is missing.

## Testing

src/spice2x/util/libutils.h

@@ -25,7 +25,7 @@ namespace libutils {
     }
 
     void check_duplicate_dlls();
-    void warn_if_dll_exists(const std::string &file_name);
+    bool warn_if_dll_exists(const std::string &file_name);
 
     // get module handle helpers
     HMODULE get_module(const char *module_name);