Windows file path with dot in the middle not converted to NT path properly

convert_to_NT_file_path() is supposed to handle relative paths (#298 (closed)) yet it fails to remove a dot in the middle:

os_internal_create_file: |C:/derek/drmemory/git/build_x64_dbg/./bin64/drfuzz.dll| => |\??\C:\derek\drmemory\git\build_x64_dbg\.\bin64\drfuzz.dll|